R.P.M.

iTrader: (3)

LOL, well we finally got around to finishing up our race car and got it on a dyno to get it running properly.

It runs pretty good...but we really are killing top end power with the turbo we left on it haha.

What we did was try using the T04R BB turbo that was on the car originally that had a streetported engine in it. We went and massively half bridge ported the engine and just decided to run the old turbo on it to see what we could get out of it.

Needless to say I didn't think the bridgeport would kill the power that much up top. It dyno'ed 320whp and 230ft/lbs peaking at 7500rpm then sharply dropping off power.
We started off at 8psi and it went 302whp then bumped it up to 11psi and only gained 18whp!

The .96 A/R P trim exhaust side is really choking it off in the higher rpm's for sure.
BTW we did all this on regular 94 octane pump gas with 100:1 premix ratio.

Anywho...heres a couple vids

http://www.youtube.com/watch?v=sFrCHzl33gI

http://www.youtube.com/watch?v=2DCaAg8dqwo

Fun stuff, we're going to take it to a track real soon just to see what its like, might be alot of fun with all the low end power and quick spool up

Directfreak

iTrader: (2)

?? I have a smaller housing, and have no problems getting more. Are you sure the bottleneck isn't somewhere else?

R.P.M.

iTrader: (3)

You have a half bridge Cosmo RE? How large are the bridge ports?
The engine in ours has a fairly large bridge, I had to notch the housings quite a bit to make it flow properly.
The exhaust is also a 3" straight pipe right off the turbo to a Magnaflow 3" straight through muffler at the rear, I cant really think of any other restrictions that would hold back the power.

nik

Hey Joe, what kind of dyno was it on? 320 whp at 11 psi is really not bad... What was the target airfuel ratio?

Let me know when/what track you guys bring it to, i'd love to see it!

R.P.M.

iTrader: (3)

It was on Magnus' 4wheel Dynojet dyno. We hit a very constant 11.2 AFR all across the RPM range. We wanted it to be safe...

BTW Nik, do you know of any lapping days coming up at Mosport that we can run the car at?

Heisenberg

iTrader: (3)

Why run that size turbo with that kind of boost? That turbo should start coming to life over 17psi.

RETed

Pre versus post BP dyno graphs?


-Ted

nik

I know calabogie has a lapping day on the 5th october, but you probably violate the noise restriction (93dB at 50 ft) I'll see if i can find any mosport dates for you.

It sounds like everything is ok with your car, like backyard said, just need to run more boost!

I seed Ted is trying to restart the old BP vs SP debate again

R.P.M.

iTrader: (3)

Well we only had 94 octane in the fuel cell in it at the time of tuning. We also thought that because the power started to drop off, the exhaust side was too much of a restriction so instead of waisting dyno time we just stopped.

So you guys think if I put C16 in the fuel cell and turned up the boost to say 20psi, the exhaust side wouldn't be a restriction?

Heisenberg

iTrader: (3)

Nope. The T04R is going to be much more efficient at 20psi and the hot side should not be restricting you. My guess is you will easily break 400whp with a proper tune. Just be sure who ever is tuning at those levels knows what he is doing.

classicauto

iTrader: (3)

Nice Joe!!

Turn up the wick!!!!! With race gas of course

13bturbofc

iTrader: (4)

??? with that turbo and a half bridge RE i would think you can break 500 no problem if your boost level is high enough..my freind made like 423whp at 18psi in a stock port FC motor and a .84 T04R.. i hear the T04R dosent wake up till like 17-20psi

streetpower

my hong kong sports TO4R with a 1.32 exhaust made 380 rwhp on a streetport
you do need a bigger exhaut to run a bridge port turbo application......

R.P.M.

iTrader: (3)

[quote]??? with that turbo and a half bridge RE i would think you can break 500 no problem if your boost level is high enough..my freind made like 423whp at 18psi in a stock port FC motor and a .84 T04R.. i hear the T04R dosent wake up till like 17-20psi[quote]


LOL, well apparently....

We have invested alot of time and money into this car and we didn't really feel like blowing it up at 20psi on pump gas, thats why we didn't go any further with the tuning.

So maybe once we get back from SevenStock, we'll throw in some C16 and pull the wastegate lines off and see what happens! haha

13bturbofc

iTrader: (4)

yeah i personally if it were my motor i wouldnt go over 14psi on pump gas..my buddy had a meth injection setup on his fc when he was boostin it that high..if i were you i would buy a meth kit ASAP it may be your best investment yet..or just run c16 lol..but meth is much cheaper

hondahater

iTrader: (2)

lol this pump gas / boost number is getting smaller by the day. I remember when 17psi was "ok" on pump gas. I'm not sure what it is but pretty soon no one is going to boost without c16 or alky, lol.

13bturbofc

iTrader: (4)

lol this is true maybe its cause engines are costing more and more every year so people are scared to run alot of boost i know after spending 3k on just my short block im not taking any chances

nik

With proper everything (intercooling, tuning, spark plugs, engine oil and coolant temps, etc...) you can easily run 17 psi in race conditions on that 94 fuel. That's what we run in the race car bulletproof 2 seasons no blown engines(not due to detonation at least).

A year or so ago max was running 20 or 21 psi on a much bigger turbo(T51) and a half bridge engine, on only 91 pump. Canadian gas is pretty good

Heisenberg

iTrader: (3)

I take it that was under 15psi?

hondahater

iTrader: (2)

I don't see why people just don't add a water/alky injection kit to thier car along with the single turbo they go to. It's cheap insurance and alows for higher boost levels with the same octane gas. I'm going to run c16 on about 25-30psi (if I can get there with my .96 / half bridge) but anything under 25 is 93 and alky.

Aaron Cake

iTrader: (1)

Here's a few videos of the car I took several months ago:

http://www.youtube.com/watch?v=xk1yertKjfk

http://www.youtube.com/watch?v=DKaoxJ7dCzw

http://www.youtube.com/watch?v=Y4Eme4GGXwA

streetpower

Yeh it was at 9psi

streetpower

Marco looks like a kid in that FC

BDC

Glad to hear it's running.

Joe, send me the map off that car and let me see what you guys were doing. Maybe I can help as both the power and torque numbers sound comparably low. I don't believe the 0.96 A/R P-Trim exhaust to be a choke point creating any high exh pressure and reversion; atleast, not yet.

B

coxxoc

iTrader: (3)

Turn up the boost guys. I'm running a smaller T04R with 17lbs 91 octane on the street. I definately dont go easy on it.