whent to the track 7/3/05 worked all winter on this project.
this is a compleet 85 irock in street trim. Not a striped down drag car. 3500 + lbs. 60 over 350 custom cam ,edelbrock base and runers mod.plenum and mass air flo. with an 870 ecm. thats wright an 870 ecm. my own custom chip, 700r4 4.11 gears.
NO NITROUS
AND YES I AM STILL SMILING

60 ft 1.813
594ft 7.841
1/8 8.339 @86.05mph
1/4 12.883@106.16mph

 

Very good and nice numbers. Now you can join the TPI 12 second club. I hope to be in the 12.5's by the end of the year. Allen

 

Sweet, nice to see someon wringing out the 870 :-)

Everyone ditches it and goes for the 165.

Though, I will admit I am curious, any plans for upgrading to the 165 and rebuilding your tune and seeing if u can better your results? would be a neat comaprison.

later
Jeremy

 

WOW !!!!!!!!!!!!!!! i have that same setup . But I am really tame with my cam (ZZ4). Are you running stock heads ???


LONG LIVE TPI


Do you mind giveing an idea of the cam you used ? I am very curious

 

Your ZZ4 cam should not be holding you back. It can make plenty of power. Yours heads "could" be holding you back depending on how well they flow.

 

very true . I am runnnig the stock 083's with a 3 angle valve job and they are studded and runnnig Magnum rockers . Frig I had no idea you could make them things .....WITH TPI get down there into the 12's



....still curious about the cam and head work though ..... just generall curiousity .


WTG !

 

My motor is a .060 over 350 dart sportsmon II heads (cast iron) 10/1 comp. cam is 216/520I 226/544E 112lca. no port work on the heads mached to felpro 1204 gaskets but I did I did a lot of porting and maching of the plenum /runners and base, I built a flow bench for testing all of the components it is trully amazing the things you can find that hert peformance when you start realy testing thing Hear is one example I started to symeese the runers after cuting in to them about 3 in. I found I had lost 30 cfm of flow what a pain it was to weld it back up! I did find one very interesting thing that I have never hear eny one hear adress before. The back of the iar intake (air cleaner cover) that ataches to the maf. is the most restrictive part of the intake track. it was a prety good trick to open it up and keep it looking stock

 

as far as changing ecm I have no plans at this time. I ran with my LM1 and loged all the runs, a/f is 12.5-1 +- .25 all the way threw every gear dont now how to improve on that with a diforent ecm.

 

You are right on the intake where it goes from "flat" to round on the Camaro. That area needs to be opened up. Some of the guys locally here in Southern California found out the same thing and modified the intake.

I have a Firebird and the whole thing is a restriction so I made up my own CAI system.

By the way how does your car idle with that cam and what rpm do you have it set at. Allen

 

nice job

have fun with it

we just tooled around the other night with her Formula 350 and i have to say i was quiet impressed
lites the tires up easily.

 

its scot - do you have any pics or can you describe in some detail how you opened up the air intake before the MAF? its obvious that its a flow restriction and id like to open it up.

 

wow 4.11's with TPI??? damn those are steep.

you must be crossing the line in the low part of 4th gear or VERY high in 3rd somewhere. i think thats hurting you


did you siamese the base at all? you have edelbrock runners.... did you cut the top or the bottom?

 

with 411 gears and 26in tiresI go thrue the traps @ about 6000 in 3rd if I shift in to 4th it picks up obout 1 mph but looses some et. with 28in tires its about 5600 rpms and a little faster, I had 342 gears and it mite be faster with them but the 411s are a lot more fun on the street.

This thing idles at 700 rpms in drive and you can bearly tell it has a big cam in it no lope at all. very short overlap!

I have pics of the whole project including how I built my flow bench. I will be happy to give a dicription with picks of how I moded. the air intake I will post it here in the next day or two

I cut in to the runers down from the top basicly turning the the the 2 tubes in to one ovel rounding every thing over. with the runers only on the flow bench I could stick my fingers in to the cut out to replace what i had removed and the flow would go back up to were it was when i started. I was shocked to see how the turbulance that was created hurt the flow.I endid up honing the runers out to 1.690 in. and got them to flow just over 300 cfm. And no I would never never never symeese the base manifold. I did pin it all together withe .125 dowels so it is all perfectly match ported.

 

Interesting as my SLP runners are siamesed all the way on one pair and almost all the way on the other. With the runner and plenum mods I did I pick up about 22RWHP and 27RWTQ. There was a good pickup of power all across the rpm band.

I was surprised the torque picked up like it did because in essence I shortend the runner. My runner is now basically the Edelbrock manifold and whats in the head. My runners and Manifold are about 1.70" which is virtually the same as yours.

I see your LSA is 112 degrees. The cam I'm thinking of getting has a 113 degree seperation angle. I'm encouraged by your good idle in the 700rpm range. Allen

 

I no that slp and outher comanys seem to have came up with ways the gain power with there symeesed runers as you seid they are not all cut the same. It must have taken a lot of resurch on there part to find the right combo. there are formulas for figuring out the corect runer lenth based on intake puls with ect. from the reaserch I have done it seams that a large Diamiter has the most efect on the rpm range tends to spred it out. I must apolagise for my spelling I do the best i can! By the way I used a top flite golf ball as my guage to keep things uniform it drops from the plenum all the way just out side head port.

 

I AM SURE THIS IS NOT THE BEST PLACE TO POST THIS MABY SOMONE CAN ADVISE ME. THANKS SCOT

This is the way I found to help increase the flow from the air cleaner to the mass airflow on my camaro tpi. (I found this bottleneck to be the most restrictive part of the intake tract) I took a parallel wood working clamp cut it down to fit in the opening then took a peace of 3 in. exhaust pipe split it in half and attach the two halves to the clamp with two way tape. I then put a couple of hose clamps around the section of the housing where the maf. Goes in to prevent distorting it too much. There is a small ledge in the bottom of the opening that I cut out with a die grinder and glued up with 3m super weather strip adhesive. Then I inserted the clamp inside of the housing and began applying pressure out ward. Then slowly started to apply heat with a heat gun. YOU MUST TAKE YOUR TIME ! I would heat a little then expand it a little. You wont to keep some water handy so you can cool it off if it starts to expand in places you don’t wont it to. I found I could not remove the step completely so I made a small spacer (the white peace in the photo) out of a peace of 3 in. PVC pipe. And shaped it to a perfect fit. This peace smoothes the transition to the maf. I cant tell you how much this mod. Is worth in performance or exact cfm my flow bench is not powerful enough give accurate readings. However @ about 7 in of water it shows about 5% more flow. So you be the judge

 

pic.s of mod.