I've had an itch to put an order in on some SLP runners. I'm not trying for a total engine package or anything, costs too much cash, just want some bolt ons. I was so close to ordering them a couple of minutes ago, but I thought, well, maybe somebody on the forum has used them and has pos. or neg. feedback. I think they look great, but I really was hoping for some descent perf. gains. Anybody running with these things, anybody wanting to get rid of their set? Let me know. Thanks

 

consensus seems to be that AS&M is a better part

 

They used to have problems but they have supposed to have fixed that problem. Don't know if they have or not. The problem was that they were basically not tuned, meaning they were all different lengths.

Lets try and keep this on if they are good or not as I bet if he is worried about money he is not wanting to go out and spend $400+ on runners. The SLP runners are about half that.

 

Yeah, I just checked into the AS&M's. 400 for the large tubes and 495 for the semi siamese, WOW!!! I'm liking SLP's 250. That's just price though, I'm willing to pay more if they are really worth that much more money.

 

I've a set of AS&M that I CAN send to N.C. for your inspection. I've some relatives down by Willimston (sp). I broke down and got a Superram.

Email me private if your interested.

-Phil

All new MAF are not created equal!

 

I don't think you'd see much, if any, improvement with just the runners, or even runners and ported plennum. To make this mod worthwhile you will need to replace the manifold as well.


[Modified by Paul Campbell, 9:00 AM 5/17/2002]

 

I agree with paul. I don't have personal experience to verify it (SLP runners and Accel base go on this weekend :yesnod: ), but that's the general consensus, and it makes sense. You'll get little/no additional air into the motor if you put on big runners and still push the air through the 1.5" manifold runners.

 

Have you considered getting headers?
I think you will get more bang for your buck (performance increase) with headers vs. only adding larger runners. Runners alone will probably give you next to nothing in terms of a performance increase. :cheers:

 

That is a valid concept, that shoving more air into the same size base ports will not increase performance. But what about the issue of speed of airflow? If you have a modified exhaust (possibly just muffler deletes) the intake air will be expelled quicker, thus resulting in more air passing through the large runners yet the same small ports. I've been kicking around the runner idea also, with consideration to the base. The consensus here does seem to be change the base also. :seeya

 

I have a 52MM BBK throttle body the pletumn along with the SLP runners have been ported. They sit on top of a base that has been ported by DRM. The combination works just great.

 

Here is a pic of the SLP's on my '85...

 

Vette_Crazy,

I was thinking of this for my 85. Did you port the plenum or install a larger throttle body or manifold base?

 

If you go with the siamese runners you will lose a little low end though gain top end breathing. Some exhaust work like front Y, cat & cat-back would offset this loss pretty well.

Vic'89 had a larger base with stock runners and got no gain till he installed the AS&M LT runners. The combo was worth 15hp. We don't know if the LTRs with a stock base would net any gain though.

With your mods exhaust work would not only likely net more gain but "improve" sound too.

 

I was thinking about runners because I had heard that the runners were the weak link in the TPI and the plenum and base will flow more, it's just that the runners are restricting them. I'll probobly look around for a week or so and if I can't find any used I'll call up SLP. Doesn't greater intake air velocity = more torque, and greater airflow = more horsepower? If not that then it's the other way around, I always get these mixed up. I don't really want to do any more exhaust work, I pulled my mufflers which worked great, but my county just passed some smog check act so now we are gonna have to be smog tested, I don't want to yank my pre cats and have to worry about passing the test. Headers aren't out of the question


[Modified by tarheelracer, 9:48 PM 5/17/2002]

 

i wonder how hard totally siamising those slp runners would be, there shape just asks for it and i'm sure it would flow pretty well. only problem is i can't tell people my engine is bone stock at the races anymore ;)

 

SLP runners = poor fitting and no significant gains.I have them but took them off the car to port them more.There was no increase I could tell of.The factory runners went back on and the car felt stronger.
The SLP's may havemade the midrange a little better but it was tough to tell.

However,if you buy them,DO port them out to large tube size.Get the lrge runner gaskets for ASM or TPIS runners and use that as a template to open them up.The SLP's were actually smaller in diameter then the stock runners opening,but larger inside somewhat.

The siamese wall can be knocked down alot and to fully siamese them all the way down,you would need to cut the back off and cut the wall down,then reweld the back on again.Its cast aluminum and can be grinded and welded pretty easily.

Someone on the thirdgen.org did this and cut the backs off,knocked everything down smooth and rewelded them and made a homemade SR style runner set up.

I have began the process of doing the same,Ive knocked the walls down going near the bottom above the bottom bolt hole and it will shorten the runner length to about 2-3 inches tall and now the plenum and most of the runner will act as a larger plenum.
I put this project on hold and havent finished,but can imagine these runners ported way down in there will push the rpm, range a little higher and maybe make more HP.
(Its also ALOT of work..alot of grinding and grinding,plan to spend hours and hours if youre not very experienced like I was at first)

However,if youre planning to keep the runners stock,dont bother and save the money and get ASM or equivalent.A magazine tests ive read as well showed them to be the best and showed real gains with them,but none from the SLPs in stock form.

(Btw,paying a machine shop to port the SLP's will run you between 275-400 bucks.I called around and went to a few and they all quoted me over 250 bucks to port them,so add that to the cost of the runners and youre better off getting large tubes)
:)