JP2002LS1

Well without changing anything but the carb/intake swap I drove my vette and what a difference. I have a 600 cfm holley and torquer II intake instead of the TPI. low end torque was lost and so was gas mileage but I still have to tune my carb. the torquer II is great except on the highway, cruising at 2000 rpm it feels sluggish with the tc locked up but when I downshift it flies, the power difference over the TPI is amazing, TPI only made power to 5000 and it wasn't much, now it feels soooo much quicker at high rpm. The one problem I have is that at 5500-6000 rpm it makes a popping sound from the exhaust like its running out of fuel or something, it might be my secondary float too low causing the bowl not to fill up, I set my fuel pressure at 7 psi. The carb is amazing over the TPI and it feels like a different car, the only problem was that it took a few minutes to start in 16 degree f weather (this isn't my winter car so it isn't a big problem). Once I solve my poppin problem at high rpm I am going to put on my headers and new exhaust (my exhaust is leaking bad and killing my power)
Oh and the reason I stuck with the torquer II is because it is the only intake that can make power to 6500 rpm and still fit under my hood.

406-IROC

If you change over to a dual-plane intake manifold over you're single plane, this will help you with you're low end torque/power loss....

That popping noise can be a number of things, but if you're fuel pressure is set a 7-psi, then it might not be fuel starvation.... it could be a weak spark, or you're timing might be off slightly.

The PITA of the Carb, is that it's all trial and error....but pays HUGE dividends when you're all dialed in.

BTW, what kind of Carb are you running?

Disregard that question.... just re-read you're running a Holley 600.

JP2002LS1

I have a summit HEI distributor and my timing is set at 6 degrees, is that about right?

88IROC350TPI

I'd throw away that Torquer II intake ...they're crap in my opinion. 6 degrees initial is also a little low. With my L98 I could run like 12 initial timing without it pinging.

GASGZLR

Maybe your floating the valves. 6000 rpm seems high for a stock L98 that is that old. Just a thought as to what the popping could be. I agree, try to run at least 12 degrees initial. I am at 5500 feet and I can run 16 initial 40 total with iron heads and 10.5:1 compression and NO ping just tons of torque. The only way is to tune it at the track.

JP2002LS1

I just got my new exhaust on so next week I want to tune the car after I finish my final exams in school. Why does everyone hate the torquer II so much? I have no driveability issues and it pulls great at high rpm just lacks a little low end torque. Also my heads were redone less than 10k ago when the engine was rebuilt so I don't think the valves are floating, the spring pressures are set high.

Apeiron

About the only thing the Torquer II has going for it is its low profile, which along with its small runners limits its breathing at higher speeds. It's also a single plane which limits its low-end performance as well, so it's pretty much the worst of both worlds. There are better, newer designs on the market, if you have the hood clearance.

z28monster

iTrader: (1)

is it a 350?? if it is a 600CFM carb sounds a little small to me i would have gon with a 750 a 600 is good for a 305

88IROC350TPI

Your car would go faster with a dual-plane intake like the Edelbrock RPM. Your motor isn't designed for top-end power so using an intake like that is probably hurting you more than you'd think. 600cfm carb is a wee bit too small but I think its alright.

SSC

The big problem is the manifold. The one you are using just sucks......... I'm not trying to be mean or rude but its not going to work well and you seem to have found that out. Dont take manifold specs seriosly. Just because one says idle- 5000 doesent mean its going to die at 5000 like your TPI did. An Action+ would work great with your setup, so would a Stealth or Performer RPM. If you used the correct air cleaner assembly it would even fit under your hood. Someone around here has the link for the SS BBC style drop base pan I just forget who.

JP2002LS1

Thanks for all the input guys, any input is helpful. the performer rpm will not fit under my corvette hood, not even with a drop base.

I was thinking of a Weiand axcelerator single plane or the Weiand action plus dual plane, I've heard the regular edelbrock performer just doesn't pull well at high rpm?????????

Oh and one thing I've found with the torquer II is that it makes good power even at 6000 rpm on my car but at 70 mph on the highway I cruise at 2000 rpm and it gets horrible gas mileage. I plan on swapping the intake in a few weeks if I continue to get crappy gas mileage and bad highway manners at 2000-2500 rpm, since I drive 120 highway miles per day.
Oh and I have a mild cam, and a 2400 stall converter, lt headers, etc. and I plan on getting new heads next year.

SSC

It's been a while since Ive worked on a vett your style but theres always an option. The 80 I built up fit perfect with an RPM and the triangle of death. Thats a different animal with a bit more room though. You might take a less conventinal approach and try another type of lid. An assembly from a mid/late 90's ram truck MPI, some ducting and cone filter that you could put almost any where. You get the idea.

JP2002LS1

the cone filter is a good idea, maybe I will take the K&N cold air system off my dads 2001 ram and see if it would work, but I think it is taller than a regular air box. I had to bend down the center of a Summit air box just to clear the torquer ii. Thanks.

Chickenman35

I agree on this one. Popping through the exhaust or carb at high RPM is usually a sign of valve float. Upgrade to some good valve springs. Isky one of the best IMHO. Quote: Also my heads were redone less than 10k ago when the engine was rebuilt so I don't think the valves are floating, the spring pressures are set high.

That doesn't necessarily mean a lot. What are the pressures? What are the springs? It takes very good NEW High Performance springs to run over 6,000 RPM with any type of cam . Usually a Dual spring is required. Just becomes too much for a single to handle. The more aggressive the cam...the more spring you need.

The Performer RPM is far superior to a Torker or Torker 2. One of the best manifolds ever made by Edelbrock IMHO ( and by most of the Edelbrock Techs that I've talked to ). I run mine to 7,000+ quite often during Hillclimbs. Still making tons of power. Course it all depends on the " package ".

Bummer about the 'Vette hood clearnace. A Performer RPM would be ideal. A regular Performer dual-plane should fit just fine.

The regular Performer will work up to about 6,500....it's not strong there, but it will go to 6,500. 6,000 really about the upper limit. But think about it....street driven car. How much of your time is actaully spent above 5,000 RPM? You're better off to maximise bottom end and mid-range power with something like a good Dual-Plane manifold, like a Performer, rather than use out dated technology like the Torker 2. You'll get much better gas milage as well.

600CFM also a bit on the small side, particularily for a Dual Plane manifold. A 650 to 750CFM would have been better.

MIKE 1985

hello jp

i have an 85 vette that i have started the same switch on. The intake i chose was the weiand stealth. I went to the eldebrock and weiand web site and they post all the heights. The stealth is 1" shorter than a performer rpm. Sorry i didn't look into the singleplanes. I also was recommended this intake from a couple guys on the corvette forum.

My combo is
355
stock crank, rods ( ARP bolts)
flat top hyper pistons
224-235 @.050 488-518 with the 1.6 RR on 112 LSA
dart 180 cc iron eagles
i have the 1-3/4" long tubes and dual ex.
750 vac secondary ( holley)
GM HEI
2400 stall and stock 3.07 gears.

i will be back on the road next month. I'll let you know how it all works out.



BTW ...the dash is in and complete. Looks and works great. I'll try and get you some pic's.