has anybody used this chip ? and if so I'm wondering if it would help with air to fuel ratio on a modified 82 vette ?

 

What kind of mods?

 

Capnron -- IIRC you are using AFR180 heads along with a 109int @ .05 cam and a renegade (and 85 FPump) BUT with stock injectors. Your heads/cam/intake are now capable of 400+HP but your injectors can only support ~240hp even dialed up a couple psi from 12 to 14. You need bigger injectors and higher psi

 

The Hypertech (Streetrunner) was well worth the cost if only for the improvements to auto trans shift quality.

 

The 1982 700R4 tranny is not an ECM-controlled transmission. Only the lockup feature is electronically controlled. A "chip" swap will not change shift points or shift quality - this is controlled mechanically by the TV cable and the governor - just like any other pre-ECM transmission.

The Hypertech chip will not change air/fuel ratio. A modified engine does not need a different air/fuel ratio than any other engine, but it will need higher flowing injectors and a good fuel system which will maintain fuel pressure at WOT in the 14 psi range. You otherwise stand a chance of leaning out at WOT - not due to the ECM chip, but due to the flow limitations of the stock injectors and pump. The Hypertech chip changes the cooling fan "on" temperature to keep engine temps a little lower, and it advances the timing a little with a more aggressive timing curve. That's it.

Lars

 

^^^THIS^^^

The best thing to do really is to purchase my new Rev "D" HAM Board and then have Dynamic EFI install it into a 1227747 ECM with the EBL Flash II and start tuning for performance. You will have everything you need to make it haul A** and then some. Oh, and the stock injectors WILL NOT WORK to make the HP you want, go either 80 or 90s. I would also go with a 2.0" TB bore and external FP regulator. Hope this helps. If not, PM me and I will send my number and we can talk.

 

will the bigger injectors alone give me the higher psi

 

thanks sounds good

 

Sorry Lars, but respectfully disagree. Perhaps we're defining `shift quality' a little differently. You're probably referring to it's proper shift point timing, operation or duration as designed. But, it is poorly designed and GM management acknowledged it's issues - especially after so many customers complained while under warranty. "Quality" is equally driven by customer perception, not design specs.
The hypertech chip has a significant positive effect on the 82/84 700-R4's "shift quality" which your above note implies is incidental. ("Only...." "That's It".). But, it basically fixes the primary causal issue. Immediately, at that. As I believe you know (as I do from talking to Dave McLellan, the `82 Corvette Chief Program engineer at a June club event, and being an OEM rep for years, daily interfacing with customers and my Dealer's Techs), The native eprom is programmed to maximize fuel economy by locking up the trans in a higher gear at the lowest possible RPM - causing harshness, lugging and the is fully connected to shift quality. It does improve fuel economy by essentially locking in a lower RPM, but gawd, it lugs - gets old after several thousand miles - and, it was one of GM's top reasons for customer assistance requests (CARs) being opened by upset 1982 owners (followed closely by cost of ownership due to brake repairs). The premature lock-up point causes NVH issues (especially H) during the down-shifting process (and, some on the upshift as it unlocks) which is noticeable and equally important to shift quality/feel/experience. The Hypertech did their homework/testing and the chip significantly enhances it virtually without tradeoff. The primitive native chip is obviously not dealer-programmable, and while GM knew exactly how to fix it they could not legally provide an alternative to their irate C3/C4 owners without having the entire system recalibrated and recertified by the EPA - and Dave McClellan said they barely squeaked by with their `82 corporate avg. fuel economy mandate in the 11th hour.
I just want to be clear that my recommendation is first hand and researched - as you stated the eprom does not control the 700-R4's shift points as modern transmissions have in recent decades, but the Hypertech chip is the transmission performance upgrade that GM would have released if legally possible.

DV

 

Exactly. Good info. As stated, the 82 700R4 is not an ECM-controlled transmission - only the lockup feature is ECM controlled, as we have both stated. Changing the lockup point will obviously have a coincidental "trickle-down" effect on overall vehicle "feel" in 4th gear, but the chip itself does not directly control shift points or shift quality of gears 1-4, other than the lockup engagement point. This is why the 700R4 can be so easily retrofitted into any non-ECM vehicle - you simply mate it with a vacuum switch or pressure switch to allow lockup in 4th gear, and to allow release of lockup upon loss of vacuum or downshift out of 4th gear. TCI, and other manufacturers, make easy-to-install, non-ECM controlled kits to do this - no ECM is required for the 700R4 to operate correctly through gears 1-4. I've owned an 82 and an 84 with this tranny/system, and I have done 700R4 swaps into 1st Gen Camaros. I did the Hypertech chip install in my '84: It lowered engine temps on hot days by turning the fan on sooner, and it elevated the lockup rpm. Off-idle throttle response was slightly better due to increased ignition timing. That's all the chip does.

But back to the actual question: The Hypertech chip will have no effect on the OP's air/fuel ratio.

Lars