ASM runners
Thread Starter
Instructor
Joined: Jul 2005
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ASM runners
ASM claims 30 ft/lb and 25 hp increase on a stock 5.7 with their runners. Are these numbers even close to being true? My TPI is bone stock and was thinking of adding runners to start with. I know the stock setup was basically made for a 305. My main interest is torque increase rather than stretching my rpm limit. I don't want to lose the TPI's greatest strength. Thanks.
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From: Kingman AZ
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I installed a set of ported SLP runners, home ported intake and plenum on my 91 along with new FIC BoschIII injectors. I could immediately feel a seat of the pants difference. No empirical data as I don't go to the track but I'm smiling! In fairness I had also installed a remanufactured distributor and an Accel coil at the same time.
Safety Car
Joined: Apr 2011
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As with ANY aftermarket part, keep in mind the truth would not be good for sales !
Optimism is GREAT for sales...and they CAN justify the claims based on test they perform, on their engine, in their lab, on their stand, under their controlled conditions, with the disclaimer that individual results MAY vary....
That being said...
yeah, there will be a bump in how it runs and how it feels....likely better than it was because what it WAS....was horrible at best. It will probably feel like it wants to wind out faster..maybe rev faster but it should still pull hard at the low end because the runner length has not changed much...just the vol of air flow is less limited than it was so it should be an improvement.
25 hp? I doubt it. A real 10-12 perhaps. Either way, it WILL be an improvement. HP just don't come that easily. or cheap.
Optimism is GREAT for sales...and they CAN justify the claims based on test they perform, on their engine, in their lab, on their stand, under their controlled conditions, with the disclaimer that individual results MAY vary....
That being said...
yeah, there will be a bump in how it runs and how it feels....likely better than it was because what it WAS....was horrible at best. It will probably feel like it wants to wind out faster..maybe rev faster but it should still pull hard at the low end because the runner length has not changed much...just the vol of air flow is less limited than it was so it should be an improvement.
25 hp? I doubt it. A real 10-12 perhaps. Either way, it WILL be an improvement. HP just don't come that easily. or cheap.
Le Mans Master
Joined: Nov 2009
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From: Bangkok, Thailand
I installed a set of ported SLP runners, home ported intake and plenum on my 91 along with new FIC BoschIII injectors. I could immediately feel a seat of the pants difference. No empirical data as I don't go to the track but I'm smiling! In fairness I had also installed a remanufactured distributor and an Accel coil at the same time.
I agree. I installed my Accel runners along with the Accel hi-flow base and ported plenum (although I kinda doubt the plenum porting does much) and the car pulled significantly better.
OP, while you're in there get a set of 24 lb/hr Bosch III's from fuelinjectorconnection.com Yours are probably bad/leaking and this would be the time to do the swap along with an adjustable fuel pressure regulator.
If at all possible, remove and port the hell out of your stock base or find one of the good hi-flow base manifolds to go with the runners. If not, you'll have hi-flow runners and a low flow base - kinda bass-ackwards.
Advanced
Joined: Jan 2012
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From: Jacksonville NC
Over the winter I installed the TPIS Big Mouth base, runners (runners have no marking but could be either TPIS or ASM), and a worked plenum along with FMS 24lb injectors and underdrive pulleys. It sure feels better than before. Haven't been to the drag strip yet to see what the difference is but hope to soon. I got lucky and found all of the above and then some locally on CL for an unbelievable price. Don't know that I would have spent the full cost of buying them new just yet as I have other things that my car needs first.
http://forums.corvetteforum.com/c4-t...ed-advice.html
http://forums.corvetteforum.com/c4-t...ed-advice.html
Max G’s
Joined: Nov 2008
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From: Monroe OH
NCM Sinkhole Donor
If you are complete stock a this time and you are focused on torque, keep what you got for now and start with the exhaust, mainly upront. Replace the front y-pipe cats and get a y-pipe without the cats and you may want to replace the main cat depending on the miles on the car. After exhaust, get a under drive pulley set and remove the frisbee (the big disc bolted to your water pump), you don't need it.
The large tube runners work geat with a complete package, package meaning ported plenum, large tube runners, and high flow base. The runners alone will improve a little but I don't think it is enough to justify the cost, unless you find some used. But if your budget limits you to a portion of the package, get them and at least port your plenum when you install them.
Lastly, always make sure you have a good tune up done on the car and proper timing.
The large tube runners work geat with a complete package, package meaning ported plenum, large tube runners, and high flow base. The runners alone will improve a little but I don't think it is enough to justify the cost, unless you find some used. But if your budget limits you to a portion of the package, get them and at least port your plenum when you install them.
Lastly, always make sure you have a good tune up done on the car and proper timing.
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You won't give up low rpm torque. ASM are better than other brands...and worth at least somewhat more money. ASM/TPIS runners have always (consistently) performed better than any other runner. SLPs can equal or surpass -- with a b-load of porting (or honing).
Thread Starter
Instructor
Joined: Jul 2005
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I do have a catless y-pipe, no main cat, rear y with crossover and Dynomax Super Turbos on the exhaust side of things so I figured I'd look into the intake before I get real serious with internal motor work.
Team Owner
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From: altered state
St. Jude Donor '05
I like the ASM runners they arent super thick, bolt on/go.
Still think they are undersized but oh well.
Next step should be an aftermarket base used then port the daylights out of it. Taking a stock base to its limits now will post up some flow #s just for curiosities sake. Unless you are real $ limited get the Accel if you can..Edelbrock a close 2nd
Dont worry you can grind away all day on a TPI and not lose torque they are that restricive;you will gain everywhere
Still think they are undersized but oh well.
Next step should be an aftermarket base used then port the daylights out of it. Taking a stock base to its limits now will post up some flow #s just for curiosities sake. Unless you are real $ limited get the Accel if you can..Edelbrock a close 2nd
Dont worry you can grind away all day on a TPI and not lose torque they are that restricive;you will gain everywhere
Team Owner
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From: SE NY
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A real 10-12 perhaps. Either way, it WILL be an improvement.
When in AZ I picked up a nice set of AS&M runners for my '88, upon returning home decided to siamese the stock base instead and sold the AS&Ms to a buddy. His '89 Vette picked up around 10-12chp based on trap speed increase.
Melting Slicks
Joined: Jun 2011
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From: Leland , North Carolina
They are fine if you don't want to do any porting on intake and runners. You won't feel that much difference unless you change the intake. I have SLP's ported to the max and siamesed half way down on the top with an extensively ported edelbrock intake and ported stock heads.
I liked my ported super ram on my 408 better
I liked my ported super ram on my 408 better
Drifting
Joined: Aug 2010
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Probably ASM's are good stuff but i can't accept that price $465!! it's the price of a base intake that it's a different kind of casting...
I prefer 800$ for a used Superram than $465 just for a pair of runners that i have to port anyway...
I prefer 800$ for a used Superram than $465 just for a pair of runners that i have to port anyway...
Last edited by tunedport85inject; Apr 17, 2013 at 07:35 AM.
Melting Slicks
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Race Director
Joined: Nov 2003
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From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
And, some warped/leaking lids have been reported.Before I made my choice, I talked to a forum tuner who had spoken with Lingenfelter (while he was still around). My second-hand feedback was the original creator loved the track results but thought the execution was a POS. IIRC, he said he wouldn't own one himself! LOL
This was a major reason I opted for a different route. Plus, with any purchase being second-hand, there's no guarantee you won't be buying someone else's problem(s).
The FIRST FI intake, on the other hand, seems to be the best intake with similar rpm focus -- that's still made (and supported) by the manufacturer.
Melting Slicks
Joined: Jun 2011
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From: Leland , North Carolina