Dustin Yenny
Registered User
I'm looking for some ideas on a problem with the '93 SC I am buying. Tad removed the chip and the car seems to run good now. The problem I noticed is the car just does not seem to feel fast. I mean the stock '91 5spd that I sold Dave Dalke would stomp all over this '93....regardless that its automatic....it just doesn't seem to have any get up and go. My SVX would probably stomp it.
My thinking is the fact the exhaust he has is a true dual from the motor back. No cats, no resonator, and stock mufflers. Ported manifolds too. It appeared to be very large pipes too (possibly 2.5"...maybe a tad bit larger??). The car boosted like 8-9 psi max. It has a 10% OD pulley. I asked he confirmed that he is using the stock S/C belt....so that may be a problem too. Vac at idle is 18-19ish. Vac when you let off the gas going down the road is 21-22ish. That seemed reasonable considering thats where my other SCs always ran....so I don't think there are any Vac leaks.
I just don't know if thats a reasonable amount of boost considering how well this motor can breathe.
Below is a list of some of the mods.
70mm BBk throttle body, 42# injectors, 75mm pro-m mafs, new autolite dp spark plugs with magnecor wires.
10% overdrive pulley for supercharger, underdrive pulleys, K&N cone filter w/cold air dividor, ported heads, exhaust manifolds, and intake plenum, 3" chrome inlet tube, new felpro head gaskets, New IAC, Eibach 1.5" lowering springs, fuel pressure guage, adj feul press. regulator, and dual exhaust.
He also upgraded the fuel pump. Walbro 255 I think. I'm going to ask exactly how everything is set (fuel pressure, etc...) so I know where I'm at with that stuff to get a starting point.
I may have to talk to Phil Kuhn and get his dyno guy to fine tune this. I'm reading that I should not need a chip for this thing to run excellent. I'm thinking the S/C belt might be slipping under heavy throttle and the exhaust system is overkill. I'm going to need to put some cats on this to get it to pass PA state inspection. Can I buy a dual in and dual out resonator or don't they make those???
My thinking is the fact the exhaust he has is a true dual from the motor back. No cats, no resonator, and stock mufflers. Ported manifolds too. It appeared to be very large pipes too (possibly 2.5"...maybe a tad bit larger??). The car boosted like 8-9 psi max. It has a 10% OD pulley. I asked he confirmed that he is using the stock S/C belt....so that may be a problem too. Vac at idle is 18-19ish. Vac when you let off the gas going down the road is 21-22ish. That seemed reasonable considering thats where my other SCs always ran....so I don't think there are any Vac leaks.
I just don't know if thats a reasonable amount of boost considering how well this motor can breathe.
Below is a list of some of the mods.
70mm BBk throttle body, 42# injectors, 75mm pro-m mafs, new autolite dp spark plugs with magnecor wires.
10% overdrive pulley for supercharger, underdrive pulleys, K&N cone filter w/cold air dividor, ported heads, exhaust manifolds, and intake plenum, 3" chrome inlet tube, new felpro head gaskets, New IAC, Eibach 1.5" lowering springs, fuel pressure guage, adj feul press. regulator, and dual exhaust.
He also upgraded the fuel pump. Walbro 255 I think. I'm going to ask exactly how everything is set (fuel pressure, etc...) so I know where I'm at with that stuff to get a starting point.
I may have to talk to Phil Kuhn and get his dyno guy to fine tune this. I'm reading that I should not need a chip for this thing to run excellent. I'm thinking the S/C belt might be slipping under heavy throttle and the exhaust system is overkill. I'm going to need to put some cats on this to get it to pass PA state inspection. Can I buy a dual in and dual out resonator or don't they make those???