I have read some mixed opinions about turbo tpi setups. I have been looking for a speed density setup, But its much easier to find a mass air setup. Can you blow through a stock mass air setup, and if not what needs to be done? Would it be easier to just get the speed density setup? I want to run like 10lbs of boost on a bottom end that is built for it. Its an everday driver. I have built a few carburated turbo cars...now Im trying to go injection. Thanks, Dan

 

You should be able to place the MAF between the compressor and the intake and not have any problems. As far as speed density goes, you can convert any TPI car to speed density, there is a kit to do this, but I don't remember who sells it.

As far as programming the thing, I believe there was a discussion on using a syclone/typhoon ecm and a $58 file from Tunercat on a TPI setup to allow the computer to see boost up to 15 PSI.

 

I thought the MAF's on the TPI cars maxed out at 255gps? That wouldn't be to fun to tune! mine maxes out at around 4700 rpm at 510gps, I would assume you could cut that rpm by a thousand or so in a TPI car?

 

I didn't think about maxing out the MAF. I didn't figure he would be able to run enough boost through the TPI to do so, but I could be wrong. But, if he switched to a speed density setup, he should be fine, right?

 

I was just wondering Y I would have to go with a typhoon computer. With a speed density system, wouldnt the map sensor show the boost and signal the computer?

 

The only way to run a blower with a MAF TPI system (ECM commonly refered to as the 165) is to use a band-aid, such as an FMU or Superfueler. This is because the ECM can handle a maximum airflow value of 255 gps. On my car, this occurs within two seconds of going to WOT. Guys have attempted in vain to use a 4th gen MAF with no success. Therefore, the only bona-fide method (other than an aftermarket controller, i.e. FAST) is to use SD and a two or three bar MAP. I am in the process of converting my MAF system with Superfueler to a 3-bar SD setup.

Note: The factory SD setup uses the 730 ECM. This ECM uses a one-bar MAP. Although it is possible to use this ECM with a two-bar MAP by "tricking" it, kpa's listed in the EPROM tables would not be correct, I prefer to use the 749 ECM found in Sy/Ty's. This system uses the two-bar MAP (up to 15-psig). I'll be taking it one step further by using a three-bar MAP, which very few (if any) have accomplished so far. The three-bar will allow the 749 to see boost values to 30-psig because I'll be seeing significantly more than 15-psig boost with my F1.

 

Wow, I never would have thought of that....On my 79 turbo camaro I have an fmu and its set to up the fuel pressure 1 psi for every 1lb of boost. Its a carbureted motor, so its easy. On the tpi, what am I going to run into as far as the computer trying to add fuel and not sensing enough air? Can I just simply set the fmu the same as my 79?


Willie,
I was also wondering where you get a 2 bar map? That sounds not only easier, But the right way to do it. Is this the method you used on your iroc? Im only planning to run 8-10lbs of boost with a turbo on my 91 camaro. Are you doing this on ur stock bottom end? and how much boost are you pushing?

Thanks for everyones help, Its great learing new stuff.

 

On the tpi, what am I going to run into as far as the computer trying to add fuel and not sensing enough air?

If your EPROM tables are correct, you will see ~12.8 to 1 A/F ratio at WOT on a naturally aspirated setup. Here's a scenario that should explain in further detail: Let's say that at WOT (N/A), the MAF registers 200 gps. With an electronic saturation point of 255 gps, there's room to "play". The problem is at with even minimal boost, say 6-psig, the MAF will easily be maxed out. So beyond 255 gps, the ECM will not compensate for the additional air produced by the blower..... Can you say Kaboom?


Can I just simply set the fmu the same as my 79?

Many use an FMU on TPI engines. It is one way to force additional fuel, but there really is no way to fine tune it. This is the reason why I elected to use the Superfueler.


I was also wondering where you get a 2 bar map?

GM
P/N 16009886


That sounds not only easier, But the right way to do it.

I agree. Please note that with this method, significantly larger injectors will be necessary.


Is this the method you used on your iroc?

Because my car is an 87 with the MAF system, it was originally simpler and most cost effective to retain the system and add the Superfueler. That was four years ago with a Paxton SN series blower producing only 6-psig. Now that I have a "real" system (F1), I'm planning on doing it correctly.


Im only planning to run 8-10lbs of boost with a turbo on my 91 camaro. Are you doing this on ur stock bottom end? and how much boost are you pushing?

My car has gone through several evolutionary cycles:

1) Up to 6-psig (Paxton SN2000):
9.3 to 1 CR,
MAF,
EPROM burned seriously rich to compensate for boost,
Stock bottom.

2) Up to 14-psig (ATI D1SC):
8.9 to 1 CR,
MAF,
Superfueler,
Stock bottom with forged slugs,
Fluidamper balancer.

3) Planning on >20-psig (possibly 25 or more) (ATI F1):
8.49 to 1 CR,
Speed Density w/three-bar MAP.
4340 knife-edged crank,
4340 rods,
Dished JE pistons,
Four-bolt conversion with studs (inner) & splayed bolts (outer),
ATI Super Damper with custom inner hub.

Hope this helps.

Willie

 

Dude, you've spent lots and lots of money buying superchargers.

 

Yes I have, but always sold them to help fund the purchase of the next generation..... and on and on it goes.... but the end is near. What my car runs with the current setup once I convert to SD and get it tuned is what it will run. I did not foresee an 11-second 305 when I started, but that's the way it's turning out.

I will then I move to my next project... Did you see my sig above? It lists my next project at the very bottom..... Sorry but it's not GM. Gonna make my grocery getter a "little" faster than it already is.

Willie

 

Man, that's alot of blower for a 305. Most people stick those things on 383's or bigger. I don't really care that it's not GM, and besides, the Lightning is a pretty sweet ride. I'd like to have one. I'm currently looking for an S10 to put the 350 TPI from my GTA into cause I'm getting rid of the car. Know anyone in FL who's looking for a body or parts?

 

Yes, it is. And so is my custom ground Cam Motion cam, as is my AFR's (who no longer make heads for a 305) and my 1-3/4" SLP's...>>>> But even with all the "big" parts typically reserved for a larger engine, my 305 has retained great every day driveability (and emissions too).

As for my truck, I've got to say she's one nice ride. What's really satisfying is blowing away guys who have no clue that I have 380 factory hp under the hood.....

Sorry dude. I don't know anyone in FL. Might want to place a classified at TGO.

Willie

 

I don't post on TGO much, maybe I will. I did make a post here in the local board. I've run a few of those trucks, they're the main reason I added a supercharger, I had one keep up with me till about 3rd gear. Now, they aren't much of a worry, and when I get my 383 built and (hopefully) change to a turbo, I really won't have any troubles.

 

Well, I don't post here much. Seems to be 95 percent 4th gens. Never having owned one, I don't know anything about them. You'll find me moderating the History/Restoration & Convertibles boards at TGO. Having driven third gens since they were new and owning the rarest regular production third gen (87 Z28 convertible), I have extensive knowledge in these areas.

I don't want to get off the primary subject, but I've got to say one more thing. There are two reasons why I bought a Lightning. First, I needed a truck. F-bodies don't have any room to haul anything. Secondly (and most importantly), they retain value extremely well. A co-worker bought a new '02 TA. It cost slightly under $30k. Thirteen months later, he traded it in on a Jeep. It got $17k for it. My truck retailed for $32k when new. FOUR YEARS later (this year), it's retail value is $26.5k. This is the reason why I won't buy a 4th gen F-body. They depreciate extremely fast....

Willie

 

Do I have to use the hole typhoon computer? or just get a chip burnt for my computer? Also, Does anyone burn chips here? I dont have access to a chip burner. If you do have one, what do you want to burn me a chip?