hey guys,

I just swapped a 300 horsepower 350 into my iroc. I have 21 lb injectors, AFPR set at 40 lbs which i know i need to push up a little, headers, exhaust and chip. I think that i need to do an intake swap to get a lot more power from this motor, I know that it needs to breath a little better. I have about $800 to spend and i wanna know what the best intake manifold and runners is to get. I already have a ported out plenum that im going to use unless there is something better out there that u guys can suggest. Thanx a lot.

 

How much do you like using a dremel. Im going to make myself love it this winter i think... Buy a SLP Siamessed runners, fully siameese them check the tech articles, port match it all to TPIS Big Mouth gaskets and bolt her back together. aside from that the only viable option under 800 is the stealthram. Everything new is more then that.

 

SLP runners are curently on sale. But I would go with the Holley Stealth Ram myself. Best bang for the $ I think.

 

stealth ram.

 

LT1

 

yea... stealth ram or LT1... miniram if you have the money.

 

Do you have to stay smog legal?

 

okay guys,
I have been taking the stealth ram into serious thought. I think im going to ask for it for christmas this year. The only thing is that im not sure if it will bolt on to my motor. The motor that I put into my car I do believe is an 79 and earlier block and heads. I will get the stealth ram if somebody can tell me that it will bolt on for sure. How much horsepower will it give me? Thanx a lot guys

 

oh yeah,
I was also wondering if the stealth ram has a provision for the cold start injector cause i have one. thanx

 

please somebody, im serious about this

 

It uses a completely different manifold, plenum and fuel rails. No place for the 9th injector AFAIK.

 

well what do i do about the 9th injector and will it atleast bolt to my new motor?

 

It'll bolt right on, no problem at all. you'll need a new chip that eliminates the cold start injector in favor of enrichment with the others, you may even consider upgrading to a later model ecu, I don't THINK it's strictly necessary though.

 

deffinately stealth ram.... thunder racing sells it for the cheapest. everything for like way under 500.

 

he doesnt need a diff ECM, he just needs to swap chips from a stock one to a later stock one.

 

can't use later chip, after 88 eliminated cold start injector but added VATS, so it wouldn't allow the car to start. He'd have to have one burned with out vats.

 

ahh, good point.... i totally forgot about vats.....


in anycase, the ECM is the same.

 

okay,
now i know about the ninth injector, now what about the EGR valve ****. will it swap over to stealth ram?

 

No EGR stuff on the HSR. Only aftermarket intake with EGR is the super ram.

 

I thaught the vat s was all together seperate?

 

vats is integrated in the ecm in 89+ models. if u put a vats chip in an earlier ecm, it won't see the resistance that it is looking for from that resistor in the key. you can't bypass it like you can in 89+ cars because there is no wiring to splice in a resistor.

 

okay guys,

Well since i have EGR and all, how will i put the stealthram on my car if I cant put the Egr on it. What do i do with the EGR?

 

Also, how much power will i expect to gain from this intake swap??

 

Results were quite considerable. Up to 50-60+ HP at the upper RPM ranges (above 4k where TPI usually falls short).

Other results are modest, but good at probabally an average of ~20 hp.

I would stay away from the LT1 if you can. Its not as good as everyone things. It is much better on an LT1 engine than an Gen 1 SBC. The LT1 doesn't have an EGR either because of the distributor.

The SR is also nice because its bored out to 58mm instead of the TPI's 48mm or the LT1's 52mm. Plus the install is MUCH cleaner.

 

You can simply take all the EGR stuff off, but that would require you to have a chip with the EGR flag turned off so it wouldn't throw a code, and if the computer doesn't know it's not there, it doesn't hurt performance. As long as you realize that this isn't emissions legal...

 

so how much does a custom chip cost? So far i need to get a chip burned to cancel out the EGR and the cold start injector, Correct?

 

What is your reasoning behind this?

 

ahh... Im sure John can post the article PHR did on the LT1 conversion and how it netted almost the same power as the super ram, and that was with a mis-matched cam... I wouldnt say the LT1 is bad.. just maybe the HSR is a better intake because of price and basic bolt on ability.

 

The LT1 intake is a hack job. Yes, it works, yes it flows well. But its really not pretty. Trying to match up all the extra vacuum lines, hoses for the remote thermostat and other things really clutters up the engine bay to no end.

I've had problems ajusting different connectors and adjustments because of the throttle body between the LT1's and TPI's are a little different, although they work. Do yourself a favor and just get a Stealth Ram. Basically the same price, and much cleaner install.

To recap, it works ok, but its REAL messy. Very hard to make the install look clean.

 

Im putting the HSR on my 88 IROC, it's a 350 also. Along with that Im putting a 52mm TB and a modified MAF sensor, so the HSR can get all the air it needs. I have heard that the gains aren't really as much as a shift in your powerband, which I've read resulted in .3-.5 of a second in the 1/4. And obviously, you wont see has much of a gain with the HSR without heads and cam, as with any induction setup you put on your motor. I would say definitly the HSR, and you would want to have your computer custom burnt anyway because it will be better for performance, other than all the essential reasons.