radiantRX-7

iTrader: (1)

When I blimp the throttle it wants to stall and then comes back online. Also when I start out in 1st gear it hesitates and then picks up. It's like it takes a full sec. for the throttle to come on before the car starts rolling. I was thinking its the leading coil that is going bad. I didnt test it yet but going to. Should I get a crane HI-6 and does anyone know the part #.?

Mods are 500R, Apexi PFC, 4" DP stright through. 550/1600's, walbro, HKS twin, new rebuild motor street ported by pettit. Meth. injection boost juice. 4 gal. in the hatch. Running 8lb's boost now.

I went to the dealer after the rebuild and they said the compression was low I was thinking it could be cause of the street port. I plan to run 25psi. on high boost after I get this fugured out. Should I get a TII 88 ignition? I hear those are the ones to get.

radiantRX-7

iTrader: (1)

anyone?

rx7rcer09

with that much boost your going to need at least 850 primaries and i would go with a MSD ignition the TII i dont think would be enough.. but i have no experience with that system.

radiantRX-7

iTrader: (1)

Yes I have them but just not in.

DaveW

I don't necessarily think that this is ignition-related. It sounds like a lean condition (similar to what used to happen with a bad accererator pump on a carburetor) So:

1. Did you check the TPS adjustment?

2. Are the throttle plates adjusted correctly?

3. Do you have any vacuum leaks? What is the idle vacuum?

Mahjik

iTrader: (1)

Porting won't effect compression, at least not enough to be that noticeable. This is why you can't tell what kind of porting an engine has just from looking at a compression test. Porting will effect the idle vacuum reading.

If you truly have low compression, then you have a problem.

rx7rcer09

go to the shop that built the motor to get a compression check, not the stealership see what numbers you get on all the faces, and if its a fresh build your shop should have some kind of warranty to fix this.

radiantRX-7

iTrader: (1)

Dave, I havent checked the TPS, or the plates. The idle vac. is around 15-13. rx7rcer; the dealership did a very good job with the testing. (I think so) the showed me exact detials of each rotor.And they seemed like they knew what they were talking about. I was watching them the whole time.
Mahjik thanks for that info. I had no idea about that.

gracer7-rx7

iTrader: (16)

Sounds like tuning or TPS as DaveW mentioned

DaveW

Vacuum sounds reasonable for a street port. W/O porting 16 is reasonable. Definitely check the TPS.

What were the compression #'s? Do you have the results, RPM at which they were done, etc.? Were they similar on all faces?

Dave

radiantRX-7

iTrader: (1)

Dont remember the #'s. I'm pretty sure they werent in psi. it was meteric. And I converted it . It was like in the 80's. I have to find that sheet.