Has anyone installed the Torqhead system on their corvette.... if so is it as truly plug and play as they claim and will I retain all my factory options of my car like ASR, ABS, Cruise Controll, full dashboard and etc? Also what do they use for the crank position sensor is it a stock LS part that I can buy at the parts store if I need to replace it? I need a retune on my car and I can not find someone that will touch the LT1 stuff so I've been really thinking about doing the LS computer to remedy this issue, and this sounds like a really good clean setup and the price seems really good too.

 

I have not installed the system as I went another route (DIY-LTCC). However, some of these are still questions I can answer.

Q: Is it truly plug-and-play? Does everything work, such as the dash, ASR, ABS, cruise, etc?
A: Yes. The system sold for the C4 Corvette by Torqhead is specifically designed to plug straight into your existing harness and make all the computers in the car happy.

Q: What do they use for the CKP?
A: This is answered on Torqhead's own FAQ page, it's GM P/N 10456248.

It's sad that you can't find someone to tune your car. More and more "tuners" these days expect to just plug a USB cable in and fiddle with a table on HPTuners, but don't actually know much more than that. Tuning the LT1 is fundamentally the same as any other GM car, so I'd be wary of any "tuner" who claimed they just couldn't do it.

Best of luck!

 

Are they available for sale now?

 

They are not, no.

 

I think the problem is that we pay for a tune. IOW, we have "flat rated" them. They want to beat "flat rate" so getting into unfamiliar territory isn't helping that. You are an enthusiast so spending 5 times the time isn't an issue. They are trying to make money so they rather get the lower hanging fruit. Can't say I blame them.

 

And that's fine! I'm just saying, you get what you pay for. If you find someone who turns you away because you have an LT1, I wouldn't trust them with anything. They're probably a "tooner" who only knows how to plug in a USB cable and upload someone else's calibration.

Tuners who know what they're doing generally wouldn't care.

 

How did we determine "I don't like your practice" to be equivalent to "you are incompetent"? Or am I misreading you since it does seem like you are saying "if you were a real tuner, you'd tune L98/LT1 or whatever I shove in front of you."?

 

Subbed for Torqhead info. It is something I see doing to my 96 lt4 in the future.

 

Will the OBD port work the same for pulling codes

 

Does anyone this message board have one on their car currently. I would like to know their experience with it and I am curious how it differs with the other 24x kits on the market. The torqhead kit definitely seems to be way more user friendly (plug and play install) and way more inexpensive compared to the other 24x kits I've seen. It almost seems too good to be true.... well I guess it kind of is seeing as the C4 kits are on hold right now.

 

Last time I talked to them, earlier LT was being developed and the later ones were done.

 

whats considered earlier whats considered later are earlier LT 92-93 later 94-96?

 

Member RichS has T Head on his Grandsport but he's far from stock. Paul gave him a base tune based on his mods and cid (397 i think?) then he got it dyno tuned from someone using HP Tuners. I believe he is happy with the results.

 

That is about it, IIRC

 

The OBD port will be OBD2, and will work as if you were tuning a C5--so you'd use HPTuners or whatever your 0411 tuning suite of choice is. The port will also of course still support 8192 ALDL for talking to the CCM, ABS/ASR, and other older components. Essentially your car, regardless of year, will end up working like the '96 Corvette did stock. OBD2 PCM, OBD1 everything else.

 

When my car was initially tuned the tuner was able to tune it through the OBD port using HP Tuners.... so it really shouldn't be any different than before... the tuner i used before explained to me that the LS computers are faster with far more advanced with the timing curves and spark advance tables as well as I guess you can set up anti-lag

 

My car was already upgraded to the LTCC ls coils when purchased.

I had a few used Optis fail on me. Last resort I tried a jegs opti worked good and failed just under 1 year. Unable to drive my car.

I researched about the TH system. Emailed and talked to Paul informative and friendly.

Paul has the TH obd II system on his Auto C4

I wanted to drive my car. I reviewed and provided my gear ratio. Current parts upgrades my tuning, Fan parameters.. ECT..

I sent Paul a spare LT1 PCM to use the Harness connectors and convert the Gen III PCM

purchased the base TH kit. Aug 2018



Paul Torqhead Kit Shipped the bad shipping coast & wait time from Canada.

Received the kit. Also bulky just barley fits in the PCM bracket.

Removed my Opti installed the new TH crank & cam cover plate Very high quality including the sensors.

This kit OBD II conversion bolts right up.

Started up ran ok..

discovered a trouble code.. this conversion You lose your dash CCC functions like mileage estimate &

dash will display proper ALDL codes..



Confirmed my ALDL pins are OBD II

I tried to scan with my PLX bluetooth

NO power..

Purchased HP tuners. could not pull codes or data log.

I tested for 12v at port 16 NO output. Grounded to known ground.

Wideband very lean at idle - 1/4 throttle 17 AFR range

Hit 11 - 10 AFR under 1/2



LT1 fans are triggered via oil temp. Also vehicle speed.

Both analog & digital coolant hit 230+ deg.

TH ls PCM no fans. Way out of driving range.. Just overheats. No way to test drive.

Validated both fans spool up when grounded

Noticed the speedo was off.. negative 20 mph..

Returned the th PCM Paul tested on his auto C4

provided my VSS / pulse parameters



ZF6 manual VSS / pulse is Nonexistent in the LS PCM Pual figured it out on his C4

The LS PCM uses different VSS pulse math vs the older LT1 PCM



Funny both of my C4s the ASR never worked.

I discovered and resolved a blown LH Courtesy fuse preventing voltage to my ALDL pin 16

After installing the TH PCM my ASR now working. Tweaked the limits to allow MAX performance without losing traction.



The th OBD II PCM arrived the tune, fan temps, speedo was better good enough to start, drive and data log.

I corrected many VE tables. ECT now the car was running great. Then stalled from a test run ultimate bad news ending this completion. After discovering micro metal fragments throughout the oil. Destroying the bearings.

Hence stalling from spark knock. Yet you could not hear or tell.

The positive.. I did learn how to tune OBD II

also can help others out with the correct VSS pules parameters.

 

so was a majority of your drivability issues a result of the blown fuse or a bad PCM... were you an earlier kit so your kit was an R&D unit? How does it run now or is your motor still out?

 

Is the VSS magic number 4006.96 pulses / mile?

 

Yes sir, I could not data log from a simple unknown blown fuse.. The PCM was actually trouble free, the VSS pulse needed a revision for his OBD II PCM. The overheating, NO fans. I believe the same fuse.
the TH "base tune" on my mild set-up. was not good enough. Paul did not have or test a ZF ~ OBD II conversion. Aug 2018 I believe only a few kits were purchased,
My engine was running very good. fans normal temp normal, I corrected the TH "base tune" data logging and my wideband.. Not as dialed. As my LT1 pcm tuning. Nov 2018 I pulled the stock LT1 engine running good. Now ready to drop my 383 using this TH system. I'm positive if i applied my current tune on a TH set-up. You would be happy.