I need a good supercharger cam for my 1988 camaro with a paxton supercharger pushing 8psi and afr eliminator heads 74cc ,the cam i have is a slp 220/230 dur lift is 502/510 on a 112 split,speedpro pistons,ported base and plenum ,stock runners 10 inch stall 2600,3.42 gears,bbk 58 mm tb,30 pound injectors.i need a cam so i can make better power .the fastest i have run with the old heads was 12.54 at 112 on street tires.i see car no blower running the same times as me.

 

What engine displacement do you have?

30# injectors seem really small for that setup. Did you have it tuned by anyone? Finding out your AFR is crutial.

Also are you running an intercooler with this setup? I would think about adding one of these or perhaps meth injection before worrying about the cam. If you can bring those IAT's down you can then tune more timing and fuel into it and you will go much faster.

 

i had trickflow heads before and it would ping alot i have the smc alk kit but it stop working the pump went out but it will still ping i have a mailorder tune from a place called lsracing but it was not right cause it pinged more he said it was the trick flow heads that they have hot spots,so i have afr's 195 with 74cc,with the timming at stock 6 degrees it is a slug but i advanced it to 10 degrees run better but i think it has more alot of shops don't tune 88 iroc no more.fastchips will do a mailorder tune but 350 is alot pcmforless he will not do mailorder because i have a blower.

 

I'm pretty sure that's your problem. Get the alky pump fixed and take it to a place that does dyno tuning for your car. You might want to look into a place that does old school SBC racing motors or something like that.

ALSO, do you have any idea what your AFR's are? It may be pinging because its low on fuel. Are you running an FMU or just the 30# injectors. If so you are probably maxing out the injectors.

 

its not pinging now that i put the afr's on and they lowerd my compresion.

 

There's a huge difference between not pinging and being tuned properly.

 

so i should get dyno tuned then or do you know of a good mail order tuner

 

IMHO, there is no such thing as a mail order tune being a good tune. Especially with a blown car, I would go to a tuner with a wideband and a dyno.

 

I don't mean to hurt your feelings but you need to take that thing to someone that knows what they are doing.

 

it is a dyno here but he only tunes mustangs but he said he could dyno it but not tune it

 

I wouldn't be so concerned that he is a mustang tuner, but has he done tpi cars and more importantly blown cars in your power range. If that is good to go, then no worries. If he is a good tuner who has shown versatility before, I wouldn't be too worried, but try posting in the Cal regional section. There has to be someone nearby who is GM specific.

 

Keep an eye on this thread.

You might be able to post one in the FI section there as well.


http://www.camaroz28.com/forums/show...=1#post5184911

 

I ran that same exact cam (the SLP-51010), with IRon sportsman-II heads, 9:1 compression, a vortech S trim. 36# injectors with NO fmu (2-bar map) and the car ran 119-120mph in the 1/4.

With the TPI setup the car ran 110mph. I think that cam works the nuts with a boosted motor. Has almost no overlap, but enough exhaust duration to get the spent charge out.

Your problem is the TPI setup first.

What is your compression ratio? If it's anything under 9:1 it's going to run like a stone no matter what you do. With only 8psi of boost on a centrifigul blower you can run about 9.5:1 compression and still be safe on pump gas. The whole "blower motor low compression" thing comes from guys running roots and screw blowers with less than 50% adibiadic efficiency. Your paxton is about 70%, and your not running nearly enough boost to justify lower compression. The 8psi paxton is meant to bolt to a 9.5:1 IRON headed stock L98.

Why aren't you posting over at TGO? Theres about 10 times more boosted cars over there, and they're all the same as yours. (Fbody)


-- Joe

 

i got it dyno tuned today numbers not good 309rwhp and 369 rwtq is the stock tpi killing my numbers.

 

I went from 110 hp 1/4 mi to 119-120mph 1/4 mi just by going from the aftermarket FULLY PORTED TPI setup to a singleplane EFI manifold I made.

Individual results may vary but still..

-- Joe

 

Antoine …
You have big lungs breathing through a long thin straw

I ran a model of your setup, best I could with what info you give.
355 cu (.035 overbore)
74cc AFR 195 ( Using stock L98 piston dish I get 8.05 comp)
SLP 51010 ( 280/288 – 224/232 @ 0.050 – 0.522/0.544 w/1.6 rockers – 112 centerline)
58 mm throttle
Stock Runners
Ported Base? (I assumed you blended out to the AFR port size)
Exhaust? (I used a typical street legal system, shorter 1-5/8 headers with about 600 cfm exhaust)
Guess 1.8 pulley ratio on Paxton (47500 imp rpm @ 6000 rpm)
I assume you are using speed density, I can’t see an MAF in your sig picture?

I’m getting about 360 hp and 460 ft-lbs torque at the flywheel, so minus 15% would be 306 hp and 391 ft-lbs at the wheels.
So the model is pretty good and I think you are getting about all you can from your setup, the way it is now.
I changed only the runner and manifold inside diameter from 1.5 inches (stock) to 1.65 inches, which would be equal to the AS&M runners and an aftermarket manifold.
60 hp at the engine, about 50 hp at the wheels, so I think that is your bottleneck.



If you fix the manifold you are going to be right at the max for these Paxton Superchargers.
425 to 450 flywheel hp is about all the CFM’s they can support, you can see the boost drop in the bottom graph.
They build boost fast, like a small turbocharger, but they don’t have the CFM’s that the newer designs (Vortech etc.) have.
So don’t go to big on the manifold (Super-Ram, Mini-Ram) or you will be looking for a new supercharger to go with it.

 

its has a mass airflow sensor,and the pistons are speedpro they are
9:7:1 with 64 cc heads i don't know what they are with 74cc heads.maybe the tuner should have added more timming?