Alrighty, I'm not sure what others are running with the GMPP HO350/SD Intake setup, but I must say that I was hoping I could have some better times at the track, so this winter I'm shooting to do some tuning and tweaking to get them a bit better. I had a good few 1/8 mile runs with my best run @ 9.126, today I only had a chance to get one 1/4 run in (emergency came up), as it was my first weekend to hit up a 1/4 mile strip, had some traction problems and ran a 14.6 with a 9.6 1/8 mile, so I know I could be in the lower 14's on a good run. so here is my setup, and the questions will follow =)

My setup
Stock TB
Plenum has been port matched to the SLP runners, and the EGR walls have been ground down as well.
The runners themselves were left the way they came from the box from SLP. 22# stock injectors.
same goes for the SD base, and the bottom end was untouched when it went in back in march.
700R4 w/ stock convertor, and as of right now a one wheel peel 2.77 9 bolt.

Right now I have a 10 bolt 3.42 rear in the works, that goes in this winter, so I know that will make a good difference and get

Besides the 10 bolt rear, I would like to work with what I have spent already on the car, and get the most out of what I have, and do what I can myself to save some bucks, although I'm not on a tight budget.

Would porting the SLP runners, and making them fully siamesed see any gains, since the SD intake would then be the choke point? The intake, any recomendations here I'm open to as i haven't really seen much on how well this flows unporterd, and the gains of porting it in comparison to being unported. Would possibly bumping up the injectors to 24# see an improvement with proper prom tuning, or would that be a bit much for this setup? I've read around that some people eliminated the EGR crossover tube on this setup, how much of an increase would be seen there?

Those are the biggest hold backs that I can think of off the top of my head that might be holding back the motor, and would love to hear some suggestions/comments from others out there who may have toyed with these things instead of just bolting them on the motor like I did and dropping it in the car. Prom tuning, and some tweaking with timing and fuel pressure are in my plans as well, maybe I'm trying to do too many things at once, but my goal is to drop into the low 13's, not sure with this setup and street tires its possible, but I don't like to say never =) Sorry for the long winded post!

 

those 2.77s are a bigger setback than you probably think, 3.42s would probably net a pretty big gain with a heavy f-body, along with the PROM. a decent converter would also be more efficient in getting that power to the rear wheels, and you could probably bump up the fuel pressure a little bit, assuming you are running stock settings. the intake probably isn't that huge of a restriction compared to this. The EGR tube probably wouldn't give u much of a gain, if any.

 

Thanks for the reply, I suppose you are right with the gears being a big set back, hope to have them in next month so maybe I'll see what happens then, and go from there, along with PROM burning. Still trying to learn more about everything before I spend the money. Still one question though, worth pulling the runners off and grinding them down at all?

 

i had those runners before the LT1 intake. Is the base matched to the runner size? I'd be sure that the ports in the base aren't already smaller than the runner size.

 

I don't remeber if they were exactly the same size or not, I want say they weren't exactly the same size, was hoping someone here knew that, and know how restrictive the intake is it self, I'd imagine it has to be better than a stock intake. Also as far as torque convertors go, should I look into having a custom one made, or what should I look for as a stall range, the car is currently my everyday driver, but I hope to have a beater car sometime in the near future so I don't wrack up the miles on the camaro, plus gas is killing me right now too...anymore suggestions? This is my first performance build up and still learning a lot as I go, so suggestions are welcome

 

yeah, the SD base is better than stock, but it mostly leaves matching the runners up to you, best to do it yourself anyway. I further siamezed the runners on mine, seemed to help some, but that was before i read the article here on fully siamezeing the runners and partially siamezeing the base, if i had i might have done that.
I personally wouldn't go over 2800 stall, probably a little lower, (have 2800 in mine) definately a lockup converter.

 

I'll tell ya, something don't sound right in your setup.

I am running the SD base on stock used Vortec heads with headers and everything else stock. see sig for times.

How bad is your traction? What are your short times and MPH?

As for convertors, I am running a vette 2100 stall tq convertor and I run 1.92x 60 ft on street tires, mind you I have suspension work done as well.

 

Okay best 1/8 mile run was 9.163 @ 77.95 MPH with a 2.171 60', that was the best run I had 1/8 mile track and that was a good launch with good traction. That 1/4 mile run I had a fair amount of wheel spin, MPH was 98.18 and the 1/8 mile time for that run was 9.6 @78.47. I agree something doesn't seem right either, granted 2.77 gears suck, and my bottom end sucks untill 2500ish RPM's, I'm hoping the 3.42's and PROM tuning will help out with that problem. Just going to have to wait untill the spring before I can really see the improvements. I also have some suspension work done as well, Hotchkis springs, Bilstein struts, Polys, Panhard rod, so I know that doesn't help with my traction problems. I'm hoping toget to the 1/4 track next weekend, and will toy with timing a little bit, and fuel pressure and see what results I get.

 

I read through all the posts and I don't see any mention of your exhaust system. In my 1989 GTA the biggest seat of the pants improvement was the SLP 1 5/8" TRI-Y headers and cat back system. If you have not freed up the exhaust system you need to do it. I agree with the others on the 3.42 gears. Allen

 

Sorry, thought I put the exhaust in there, 1 5/8 Eldelbrock into 3" flowmaster exhaust. I should just make a signature with all the cars mods, so we'll see what the gears do =) Thanks!