So my car is slower now.

Yeah. who would have thought. N/A i was running 12.5 @ 113, my best tonight was a 12.7 @ 108.

Cant complain to much, the car is hardly tuned, it runs pretty rich. My cam isnt ideal, the 4.10 gears are whats really killing me i think.


I didnt know a car with an aftermarket power adder (nitrous, turbo, supercharger) needed a fire jacket. Luckly the tech guy didnt even know the car was turboed.

Yeah. who would have thought. N/A i was running 12.5 @ 113, my best tonight was a 12.7 @ 108.

Cant complain to much, the car is hardly tuned, it runs pretty rich. My cam isnt ideal, the 4.10 gears are whats really killing me i think.


I didnt know a car with an aftermarket power adder (nitrous, turbo, supercharger) needed a fire jacket. Luckly the tech guy didnt even know the car was turboed.
What was the 60'? How does the cam size compare to your NA cam, are they the same heads as before? I would expect you to pick up a lot on 5 psi, even barely tuned.

What was the 60'? How does the cam size compare to your NA cam, are they the same heads as before? I would expect you to pick up a lot on 5 psi, even barely tuned.

I was expecting more too.

My setup is exactly the same as N/A I just added the Turbo. Cam is a 224/236 on a 110 lsa.

Im hoping its the gears just putting me out of the power band

60' was 2.007

The car "feels" a lot faster. I need to put it on a dyno to see where im at.

I was expecting more too.

My setup is exactly the same as N/A I just added the Turbo. Cam is a 224/236 on a 110 lsa.

Im hoping its the gears just putting me out of the power band

60' was 2.007

The car "feels" a lot faster. I need to put it on a dyno to see where im at.
Yea you should definitely be going a lot faster.

How bad could my gears and cam be hurting me?

How bad could my gears and cam be hurting me?
Sounds like a plug/wire/tune issue. You should still be showing a higher mph even w/ gear issues. The point is you should still be at a much higher mph than you were NA, and you LOST 5 mph, that's just about 50hp. Something is not right...

What was your AFR's going down the track????

The 4.10 gear needs to go... pop back in a 3:23 or 3:42

Cam's LCA is too tight as well. If you've got a stock one put that back in or get a turbo friendly camshaft.

What are you using to tune with ?

Dyno isn't going to get you anywhere... if you don't have a wideband. purchase that first and get your WOT AFR's in line.... Did you take any timing out of it?
Too many unanswered questions.
Tuning is VERY VERY critical on Boosted applications. You should not even be going to the track if your not super close on your tune.
~Scott

What was your AFR's going down the track????

The 4.10 gear needs to go... pop back in a 3:23 or 3:42

Cam's LCA is too tight as well. If you've got a stock one put that back in or get a turbo friendly camshaft.

Those things are not OPTIMAL, but it did not cause him to LOSE 50hp. He needs to find another 100rwhp before he goes changing the cam and gears.

Agreed.... That was a suggestion...

He needs to tune the car... You can get away with a junk tune on a N/A car but it's going to absoultly kill a boosted engine not to have proper timing/fuel. Best case it won't make any power... worst case your taking it all back apart since you burned it down with too much timing and not enough fuel.
Needs to post where his AFR's are and timing.

Agreed.... That was a suggestion...

He needs to tune the car... You can get away with a junk tune on a N/A car but it's going to absoultly kill a boosted engine not to have proper timing/fuel. Best case it won't make any power... worst case your taking it all back apart since you burned it down with too much timing and not enough fuel.
Needs to post where his AFR's are and timing.
Definitely

When I tuned my car to the dyno, I picked up over 120 Hp from my baseline run tuning spark and fuel :eek: Goes to show I wasn't even close!

Bill

When I tuned my car to the dyno, I picked up over 120 Hp from my baseline run tuning spark and fuel :eek: Goes to show I wasn't even close!

Bill
What kind of base spark were you running, and what did you end up with? I'm starting with 16.

I was running up in the lower 30's and it was pulling alot of timing, that's where I probably got alot of my gains from. I run 25 degs up to peak torque and then slowly back it off 2 or 3 degs to redline.

Bill

AFR is around 11-12:1 going down the track, yes rich. Im using LT1 eit to tune and I am running 25* timing. Any more and I start to pick up some knock retard around 4000 rpm.

I still have my compression from when I was N/A so I was keeping it rich. I am currently collecting parts to build another low compression short block that I have, pretty much just down to finding a crank.

I would like to put it on the dyno to see where I am at right now. I am also going to do some tuning while I am there.

dyno numbers don't matter, track times do. You ahve something going on pretty bad. I'd say on 5psi you should be trapping 115-120 probably.

dyno numbers don't matter, track times do. You ahve something going on pretty bad. I'd say on 5psi you should be trapping 115-120 probably.

Dyno doesnt lie as far as im concerend. There is no bad launches or missed shifts.

Like I said, Im going to do some tuning while its on the dyno too.

I know the cam isnt my only problem, but how much is the 224/236 on a 110 lsa hurting me compared to a 224/236 on a 114?

I'd definetely get the 3:42's back in her...with the power adders you have all you're going to be doing is lots and lots of spinning...I'd perhaps look into getting some better traction and doing some suspension work after you tune it and see if your times hold true to where you're at mod wise. I think w/ what you have you should easily be over 400hp.

I know the cam isnt my only problem, but how much is the 224/236 on a 110 lsa hurting me compared to a 224/236 on a 114?

The 114 lsa is a much better lsa for boost. 110 is a lot of overlap for a boosted engine. Do you have a boost guage and can verify seeing 5 psi? Just a thought, but that cam may be bleeding off some boost.

Yeah, I am seeing 5 psi on my gauge.

I dynoed 380 hp before, so I sure hope I can get more than 400 out of it adding a turbo.

Do you have any pictures of what was done on the Turbo Conversion?
Yea.. the 4:10's are not right or the cam but even with 5psi it should be scooting.
Somthing is going on.
Does it cut out... miss? anything strange?
Where are your plugs gapped at? any spark blow out?
Don't let the AFR's get any leaner than 12-1AFR Stay in the 11's.
Your MPH is bothering me alot. Dropping out of the teens back to the single 100digits.
MPH is power.
Making over 400hp with a turbo'd V8 should be a No-brainer.
It's in there.. .just somthing missing.
~Scott

The car runs great, "feels" stronger than before. Has no hiccups what-so-ever

plugs NGK TR6s and are gapped at .035 If I remeber correctly.

I really couldnt beleive how slow the car ran. I guess Ill see what I can figure out on the dyno.

Do you have any pictures of what was done on the Turbo Conversion?

Spec's? On Turbo.. piping... ect... BOV stuck open? opening wrong time? Boost controller? Boost leak somewhere?

There's somthing going on.. .just need to narrow down what it is. Your MPH with a turbo should be WAY up not several mph down.

When you find it you'll be laughing... I've seen it several times.. done it a few times my self... Don't worry.. sound like somthing simple just being missed somewhere.
~Scott



Don't worry about ET right now.. just MPH.....

I think you'll still be dissapointed after the tune w/ that cam and gears.

Use the turbo to push the car,not the gears.

That 110 LSA cam has too much overlap and is blowing boost out the exhaust = lost HP.

The turbo makes 5 psi pretty easily, so I dont think the boost blowing out the exhaust is that big of an issue, there is plenty more air following behind it to fill the cylinder.

What im worried about with the overlap is the backpressure in the exhaust system being greater than the boost pressure, and getting so exhaust back in the cylinder.

The turbo set-up was built by me, They are log style manifolds very similar to the setups realquick sells. Intercooler piping is 3", primarys on the exhaust are 1.75", passenger log is a 2.5" into 2.5" crossover into a 3" main log into the turbo. 3" downpipe in to 3" duals back behind the tranny. Im not seeing super high exhaust manifold temps or anything like that, so i dont think the system has excessive back pressure.

If I am seeing boost on my gauge can I rule out a boost leak in the intake?

my 224/236 has 10* of vavle overlap.

the 224/236 on the 114 that everyone uses has 2* of valve overlap. Could 8* be hurting me that much?

WE gota see some pic's to help troubleshoot this thing.

You can definatly have a boost leak and not know it on the intake side. Especialy at such low boost levels... 5psi is very low. I know your guy's engines are 11-1comp stock.......
How big is the down pipe? Any other restrictions?
Is the IAT sensor after the intercooler or at the air filter?
Man.. .there's got to be a leak somewhere!!!
You should be making some serious power!
~Scott

HP cams with lca's 110-106 tend to scavenge the cyl and will shove boost out the exhaust valve with out you knowing it.. btw.