I get a partial throttle surge, generally around 2500. Car does it under load or not. TPS is set correctly with no dead spots. I have seen a few post or two alluding to how the TB mod creates this, but nothing concrete. My friends car does this at a slightly lower RPM as well, both of us have done the TB mod. TIA

 

Neither your post, sig or profile say whether you even have an RC-7, let alone what model and year. Why not?

"Partial throttle surge" doesn't really make any sense, so I don't know exactly what the problem is. I do know that it's not caused by the TB mod. The only negative effect is a slight stumble if you open the throttle too fast at low rpm, and that only applies to Turbos. Not that I know if you have one...

 

********Neither your post, sig or profile say whether you even have an RC-7*******



MAN! You have a RC-7??????? Great plane. I don't see how you can afford the upkeep though.

http://www.faqs.org/docs/air/avbtsv2.html

http://www.faqs.org/docs/air/avbtsv2.html#m2

OR does NZ need typing lessons???? C and X are fairly close together. humor, please

 

Hailers, I swear you're losing your marbles. humor

 

Typing too fast, not checking before submitting, a couple of glasses of red wine, etc, etc...

 

Were not the secondary throttle plates introduced with the '86 NA and then the Turbo was introduced in '87?

Seems odd they would have included them before they needed them... Perhaps they co-developed Turbo and NA and wanted to save money on versioning?

-Rob

 

well, the TB itself is the same part from TII to NA, they just plug different routings for vac lines, and the cables are attached differently. This is because the TII's TB is mounted upside-down when compared to the NA, thus part of the reason for needing to curve the TII's throttle cable around half the engine bay while the NA's goes directly to it... except on RHD models, the TII's cable goes directly there, and i'd imagine the NA's would need to curve around, but i've never seen a RHD NA before, so I couldnt tell you from experience

 

Given that this is posted in the 2nd Gen section and not general automotive, I think it's safe to assume I have a rx7. Second, Who TF does a TB mod to a N/A car? Both cars mentioned are S4s, mine is 6port turbo and my buddies is a n/a->TII. I had the same problem when the TII parts were on my TII block, and now that they're on my N/A block. AFA the question, it surges at partial throttle, such as maintaining 5-10mph in 1st. This usually sounds like a TPS, but I've checked mine. . .

 

The FC went on sale in late-85 in Japan, and they were all turbo'd. So the Turbo actually came first.

The NA and Turbo TB's work differently because of the different distances between AFM and the throttle plates. This distance on the Turbo is much longer, so there's a delay between the throttles opening and the AFM reacting. This causes a stumble if you open the thottles too quckly at low rpm, so the secondary throttles are damped to prevent this.