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To4E 50 Trim + 9:1 Compression and 21 PSI + FWD = Good

2.9K views 13 replies 10 participants last post by  sbcxtreme  
#1 ·
All right folks, i just got back from a night of racing on the main strip and i have to share my experiance with my new turbo and compare it to the 4 turbos i have had in the past. I hope this helps someone when it comes time to upgrade there turbo!

First of all the car: 1995 Eclipse GST. Currently has 181,xxx miles on the shell. i have owned her for the last ~4 years. The motor: 6 bolt 2 liter, 9:1 compression wiseco pistons, 1G big rods, ARP hardwear, 1G stock head and intake manifold ported to match a large 1G TB, 2G ported exhaust manifold, MAFT with 3" MAF in blow thru setup with dejon UICP pipes and Greedy FMIC and 2.5" LICP, 3" turbo intake pipe, 2.5" downpipe, 2.5" test pipe, 3" Thermal R&D catback, 190 LPH pump with 650cc FIC injectors w/ stock FPR, stock compute only tuning with MAFT and retarding the base timing 4*.

Tuning: Boost/EGT/Wideband gauges, Palm Datalogger, MAFT's 4 knobs and thats it!

The install: I got the turbo off the classified section, $390 with SS AN oil return and oil feed, it has a mitsu hot side, so it bolted on to my manifold and o2 housing no problem but thats where the "bolt on" part ended.

Issues i ran into during the install: the turbo is a downflow so i had to come up with a 90* bend to make it connect to my LICP. Now if i was a good boy and ordered a 90* elbow i could have avoid the following hassle, but i'm not and i need everything now now now! I went to a muffler shop and they bent me a 2.5" 90* elbow to match my LICP and i resued the coupling i used on my t25/t28 to connect the elbow to the turbo. The big problem was the fact that the huge elbow had big clearence issues with the stock fan. i have to cut about 1.5" off each fan blade, and then cut most of the lower part of the fan shroud off to fit the elbow, again, this might be avoided by uing a 2" little elbow that you can get from most DSM shops. also an issue was the wastegate acuator: it has all 'up in the fan shroud! i just cut a little section out and its a tight but nice fit! So i guess my biggest problem was stock fan clearance, but nothing a grinder and some ingenuity couldn't take care of!

The T04E housing is huge! Most of the resear i did said i would have to dent the water pipe, not the case here! I was using a 1G turbo water pipe and actually had to grind on a small tab on the compressors housing and then grinf a small part of the tube that has the stock turbos water feed coming out of. i know its hard to under stand, but i just had to grid .1 mm off of each to make the setup work.

Overall the install was not a "bolt on" job but nothing major! I made up for the fan cutting by making sure the fans run on there highest setting whenever the computer turns them on, not matter what setting the computer wants. Search for this mod, its very easy and only requires bridging two wires on the fan's harness. It pushes a ton of air and is a temp fix until i can get some slim line fans.


Tuning: first we setup for 14 PSI to base line and make sure everythinbg was good. 14 PSI felt Okay, but nothing worth writing home about. Of course no one should buy this turbo for 14 PSI!

Slowly turned the baby up to 17 PSI and it felt GREAT! The turbo is slow to spool but feels awsome at 17PSI. I hit 17 by 4000 RPM with the poor tuning the MAFT alone offers! base timing was at the stock 5* advance and we only saw knock after a few back to back pulls. most runs ended in the 17* advance area.

Now we turn it up to 20 PSI. BADASS! this turbo pulls so much harder then the Big T28 or Big 16G could DREAM of! But i was only getting 10* advance, so i knew we where knock pretty badly! I added alittle more WOT gas and retarded the base timing down to 2* advance. Next few runs we saw 20-21 PSI with 16* advance on the logger and the bitch pulls like a raped APE!

Adding more gas would not bring the timing back so i finally took out another degree of stock timing to get 18* advance at 6800 RPM in 3rd gear and the car is pulling so hard i can not tell you how good it feels! I Mean we ran down a GTO with exhaust! Thats a badass 6 liter power plant i had nnot idea we where gonna pull a fender on a 400 HP GM :D :D :D

Now, being a FWD the turbo lag is a dream come true! the power isn't a shock at 3k RPM like the 16G or T28, it slowly moves into boost and then just rips! For rubber i have BFG Geforce 2 KDW's on 17" Konig Imagines 225/45/17 (yes, they rub!). But honestly, the lag is great and really helps make the FWD more consistent! once the turbo spoos life is GOOD and the scenery just blurs on by from 4-7k RPM!

This is all with poor tuning! Yeah the MAFT sucks at tuning and once i get my DSMLink, this turbo will be even more nasty!

Turbos i have had in the past:

T25: Nuff' said, bitch sucks!

14B: As a young DSMer the 14B was a great upgrade from the T25 but was a pain to install for the extra 30 HP i got (need 2G install kit).

Big 16G: I upgraded the 14B to a 16G within a year an i love the good 'ole 16g! I won't waste time telling you about it, but its a good turbo!

Killer T28: After my 16G died i got a really good deal on a Killer T28. Super easy to install, the T28 was a great mid range daily driver turbo, but it had NO topend pull! even at 23 PSI it was lacking punch. I would say the 16G and t28 where equall in power, but the t28 offered up the power at a mid range and the 16G had better topend (but the t28 just hit hard at 2800 RPM like the 16G couldn't!) Fun FUN turbos for around the town driving a making little rip here and there!

However, i had lots of wheel spin with the t28 because the powe came early in the RPMs and hard. This isn't a problem with the 50 trim!

The t04E turbos are nasty! i don' think i would want a more laggy turbo (wouldn't be fun to daily drive, sure it is vary streetable, but just not fun like the t28 or 50 trim is). The 50 trim is laggy to the point i don't rip it as much as i use to with the smaller turbos. But when i do rip it i don't miss the small turbos at all!

I made 330 WHP with the T28 @ 23PSI+MAFT, and the 50 trim blows it away. I have to be in the 360-380 WHP area at this point! As soon as a get a chance i will dyno her with and without DSMlink (if i have it by then!) :p

Overall: Lag is much more noticable, but i'm down with it on my FWD. Topend is killer! I MEAN KILLER!

Tonight we couldn't even find a car to race with us that had a chance! We killed a modded LS2 GTO, modded 350Z, modded trans am (not a WS6), and the only thing that hung with us was a street fighter 1100 CC yamaha bike. Blew away a 750 GSXR on the highway and got mopped by a 1300 GSXR 'busta.

Only thing in Ronanoke worth racing is damn bikes with the 50 Trim!

Tuning side note with my 9:1 CR: Only problem is alittle knock in 4th gear and having the base timing pulled back.These are issues that can only be solved with DSMLink and i can't wait! Later this week im going to get some 100 oct. race gas and try her out at 25 PSI!

Life is good and i will never look back at little turbos like the 16G! Lag sucks but the wait is well worth it and works out well on my FWD.

Thanks for reading my Book!

~William
 
#3 ·
Which brand did you buy and how hard was it to install?

Thanks
 
#6 ·
Umm I hate to tell you, but anyone that can ride a bike, should blow you away, especially from a roll. I have a 600cc bike that went 10.993 @ 128. 750s should be alittle over a 1/2 second faster than that. I dont mean to be a dick, I own both a fwd dsm thats making 350-360 whp (thats a guess I have never dynod, but im pushing over 40 lbs/min) and a 600cc gsxr and the bike will own my dsm anyday with me half ass riding it. Im glad to hear that your car is running alot better with a 50 trim though, i love my 57 trim. It makes the car so much more fun to drive. now get link and tune it for even more power
 
#7 ·
BOOSTERchair said:
I own a fwd dsm thats making 350-360 whp (thats a guess I have never dynod, but im pushing over 40 lbs/min)

I wonder what kind of power I am making.... I need to dyno the car... on my PTE SCM5031e (50 trim) and stock 2g MAS, DSMLink shows 46lbs of airflow around 21-22lbs of boost and 51lbs of airflow around 26lbs of boost. I am able to see 21 degrees of timing on both these runs with no knock (.4 and.7 being the highest). Both are on pump, just the 26lbs run it was 30degrees colder. I wonder if the car is making over 400whp. The 50 trim is def a great/fun/pump gas turbo. You can beat ALOT of cars on a 50trim car properly setup.
 
#8 ·
WOW! I love this write-up. Not only did you review the 50 trim but you also gave a quick description of the other turbos you had. 14b, 16g, t28. very informative.
 
#9 ·
Hey no problem guys.

UPDATE:

Knock is becoming an issue in 4th gear with timing being pulled to 14* at the top of 4th. I was also seeing some knock at the top of third after a few hard runs back to back (heatsoak). i changed my plugs to COLDER plugs (aka from 6's to 8's) with a smaller gap per the recomendations Diambo and nukefission had made and that worked well.

About the bikes: My room mate has a 600 RR and from 20 MPH roll he gets a jump on me then slowly pulls away. So i know the wrath of a sport bike well and love riding his RR when i can. More often then not a bike has a power to weight ratio that will give it a clear advantage. However at highway speeds you really got to tuck to get some good aerodynamics.

But i won't bench race with ya, What happened, happened and thats the end of the story. i can't tell you if they were good at riding their bikes, and for the GSXR i think traction was more of an issue for him then power, i mean it hit the rev limiter hard in 2nd and 3rd spining his tires :D i don't care how i won it was just super sweet to hang with these nasty bikes and trash the cars. i mean the bikers actually FOLLOWED ME LOOKING TO KEEP RUNNING and we did :p For about an hour we raced and just ripped it up around town. Not every day does a sport bike rider tell you "That thing is nasty" :D :D the 1300 GSXR busta was just sick and he had that badass modded. No way any one of us where going to touch that bullet.

i will mention that as the weather gets cooler here i'm having more traction issues and more knock in 4th gear. to run this compression and boost make no mistake you need a robust EMS like DSMlink. i don't think using a one time burn chip like the TMO chip will work. i'm just getting by for now with the MAFT because my 6 bolt is built and i drive her nice 90% of the time. i also treat her to 114 oct toulene to keep her happy from now on untill i get the Link.

I did run 30% toulene this weekend and had no knock in 4th. i also had to up my plugs from BPR6ES to -> BPR8ES, which worked wonders for tip in knock and timing being pulled on the highway.

From what i have heard the 20G has alot more grunt to it with plenty of mid range punch and good topend. the to4E has a slower more linear power increase with insane topend power. Andrew has had both a 20G and t04E and that was the impression he gave me.
 
#10 ·
I have a similar setup, t04e 50 trim, and I came from a ported big16g.

I had the same dejon pipes and greddy fmic. I got knock after a few hard runs.

I upgraded to the XS / SS autochrome fmic, by now I'm sure you heard of it, if not it has a big core, short route 2.5" piping. Now I don't get any knock,doing the same amount of runs/same tune, compared to the Greddy. I havn't pushed it more to see how long till it heat soaks, never had to.

Really awesome review. I totally agree on the feel of the turbo compared to the 16g. My big16g came on fast and hit hard as soon as it spooled. The 50 trim is much smoother. I have stock cams, I rode in a car with 272s, lets just say, my next mods are DKS 272s.
 
#11 ·
What are the brands of choice for the T04E 50 trim and what brand is the one that you installed?

Great write up.
 
#12 ·
newdsmman said:
I wonder what kind of power I am making.... I need to dyno the car... on my PTE SCM5031e (50 trim) and stock 2g MAS, DSMLink shows 46lbs of airflow around 21-22lbs of boost and 51lbs of airflow around 26lbs of boost. I am able to see 21 degrees of timing on both these runs with no knock (.4 and.7 being the highest). Both are on pump, just the 26lbs run it was 30degrees colder. I wonder if the car is making over 400whp. The 50 trim is def a great/fun/pump gas turbo. You can beat ALOT of cars on a 50trim car properly setup.

I have always been told that for every lb of air is good for about 9 hp, there is so much more that goes into this than just air flow readings.
 
#13 ·
This is a PTE 50 trim. 0.60 housing with the GT350 wheel (stage 3 wheel? I hate the word 'stage' but i believe thats how most reffer to this turbine wheel). I haven't opened her up but i hope it is a 360 Thrust Bearing CHAR but only time will tell.

Going to BPR8's helped with my knock. By upping my CR i have increased the engines 'thermal effiecenty' and increasing internal combustion temps as well as the heat of compression. Some people go the low CR big boost route, i would reccomend it, i don't think i would use 9:1 again .. probly go 8.5:1 or 8.1:1 ... around there.

I should put up this disclaimer: i keep saying 'knock' but i have a 2G, so everyone should know i can't actually see/log knock. I only know if i'm getting timing advance or not (which corralates to knocksum among other factors). Its playing with fire by any account and i blew the felpro :rolleyes: Headgasket i had in there. I can do a DSM HG in a few hours start to finish so its not a big dea for mel, its like having a $28 fuse :p

I think between 30% toulene+93 oct, BPR8's, Alky injection (need a new nozzle, maybe for x-mas i'll get myself one) and DSMlink i will be able to run in the 24 PSI area.

Yeah, maybe for spring time i will get some cams and a better IC, but the alky injection will help intake temps.