Quik

iTrader: (7)

what are your thoughts for a TU3 240/240 .588/.588 112 stuffed inside a 408 9.1 cr, P/P 317s, Ls2 intake, PT88, 4" DP mated to a T56. would like to keep some lope to my setup along with having a decent power range.
3500-7k is diesierd goal with 9xx/9xx to the wheels

smokinHawk

iTrader: (48)

with only a t4 flanged pte88 and a 408 i dont think you would make it to 7000rpm, maybe 6200-6500

i have 347 cubes and it spools to 15lbs at 3800-4000 rpm, so your power band starting at 3500 is reasonable. with my cubes and turbo it wants to be spun past 7500rpm though, but i only have taken it to 7200 because of my 42 lb ijectors, that i replaced with 96lbers now.

Quik

iTrader: (7)

so what do you think of the TU3. do you think it would work with this setup?

MIGHTYMOUSE

iTrader: (59)

i think the turbo is right for your cubes and manual trans, you just need a better cam to bring the powerband back say 500rpm

domination

iTrader: (2)

what do you suggest then for this setup?

qqwqeqwrqwqtq

Our TU2 (236/236 112.5 lsa) would be better suited to your combination but I would be concerned with backpressure running a single T4 on a 408.

Websy21

iTrader: (34)

I will be running a single t4 on a 408 but I am not going all out race so shouldn't see a problem.......... hopefully. I think everything looks decent other than the cam, good luck and let me know how it go's.

MIGHTYMOUSE

iTrader: (59)

i considered this but here is what i thought.

say on my 6L i could run 23# boost and guess my backpressure is around 40.

since the 408 pumps more air on its own the turbo will only be able to supply maybe 19#. if his backpressure happens to be worse because of the cubes like worse than 2:1; he will still end up only around 40.. which is working totally fine for me and i dont think a 'problem'

additionally it will help if he can bring the revs down..
w/ the t4, smaller cam, and the bigger cubes it will make for one nasty combo as far as boost response and still make the 900 on the tires he is looking for

make sense or no?

qqwqeqwrqwqtq

Did you measure 40psi backpressure with 23psi boost? If so that's better than what I would expect.

The only reason I say that I would be concerned is we've ran 408's with single 76's with R-trim wheels and 1.15 housing and power/rpm was lower than the identical combination with 370ci.

Now I havn't ran a T4 PT88 to know how it compares in terms of backpressure but with 400+ci I would prefer to run twin T4's or a single T6.

JZ 97 SS 1500

iTrader: (2)

PT88 on a 408 from a customers car was 19psi/52psi. That was swapped from a GT42-76 what was 18psi/59psi with a 1.28A/R.

MIGHTYMOUSE

iTrader: (59)

well i had the 19 part right.

so how was the exhaust routed on the way to the turbo, thats just as huge of a contributor

also did said guy have a muffler or anythign restrictive after the turbo? every psi after also adds a psi to before.

Websy21

iTrader: (34)

Hmmm I like this info, guru's keep it coming please

smokinHawk

iTrader: (48)

i know PurEvl has a PTE88 on his 40X cubed engine and said his back pressure numbers werent too bad,
also i think he was making 800-900something horsepower

RealQuick

iTrader: (14)

I think it was 860rwhp @ 14psi on pump gas - 408ci, PTE88 and a baby cam.

SR-71 SS

iTrader: (2)

That 112 lsa will give you a little lope but i think (and could be wrong) that u might want a little more lsa for the blower.

DrTurbo

iTrader: (3)

If I remember the setup that was mentioned above correctly it was using a 4" exhaust that was turned down before the rear axle with a Borla bullet muffler which is straight through design.

As for the headers they were 1 3/4 primaries with 2.75" Y's merging at the turbo. I know the same car has now a full thumper 91 and is switching again to the new thumper's we are coming out with, so that will be 4 turbos and data from all four. Let me see if Jose can get the data on the 91.

Quik

iTrader: (7)

Parish on his 408 ran a pt88 i do believe and made 1011rwhp/1090rwtq at 25#

i was going to run a single 4" back and have it dumped out the side. no muffler

to keep rev's down i would have to change my gearing which wont be a problem if thats what i have to do.

as for the TU2, would you have any charts of it with power or any clips of it? you guys are the proven ones so If you guys say its to large then time to listen

MIGHTYMOUSE

iTrader: (59)

ya if you have some n/a gear ratio in the car that would need to come out anyways

Quik

iTrader: (7)

4.88 with 30" tall tires with a raceweight of 4800 roughly. wanted the gear to help get the pig rolling

it was figured i could do 130 @ 7k with the 488s. so maybe ill keep eye open for some 410s. those i think would allow for 150 i believe. i just havent seen any trucks trapping anything higher then 130-135.

NA$TY-TA

iTrader: (21)

Wasnt that on spray too???????
I wouldnt run a T4 flanged 88 on a 408 but thats just me. Ill be around those cubes with my new turbo and its a T6Flanged unit. I have to have some results soon and then i also plan to test the new Thumpers from FI.com

Kyle