Do I need all new sensors?

No, you re-use all your existing sensors if you are converting from a TPI system.
I prefer a GM purchased 3 wire heated O2 sensor p/n 25312179 aka AFS-74.
You'll have to hook up the heater wires to a switched power source and ground.
When purchased from a non GM source, an inferior O2 sensor is often substituted.
This is almost a mandatory item when running headers.


Can I use the stock computer (ECM)?

Yes, you can use the stock ECM if you already have a TPI car. Some prom programming will enhance performance, available from me. If you need an ECM, here is a cross reference. ECM interchange
You will need to order a Memcal (chip) from GM if you don't already have one.

Do I need the LT1 wire harness?

No, you will use all the original wiring from the existing TPI system. One coolant temp sensor wire might have to be re-located to the remote thermostat housing.

No, not drunk. Oh well, i wasnt positive on anytihngk i was talking about anyways. I guess i was thinking if you did a OBDII TPI.
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WS6 3o5 TBI 88' Formula, 670cfm Holley Projection Throttle Body Holley Projection Intake Mainfold, Underdrive Pulley,Dual Snorkle & Factory Cowl Induction,now with short straight pipes, UMI Subframe connectors, Fourth Gen seats, Three row Radiator, Posi rear end (2.73),TPI heads, 1.6 roller rockers
15.543 @ 88.21mph

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Posted By: LeadFootedRacer On: 09-25-2007 @ 18:42:09     Reply | Top | Edit

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hey thanks pocket. now that i'm home from work, i also went and read the rest of the FAQ over there. i tried doing a little research on TGO as well.

i went and adjusted my tps and stuff. no good. the TPS reads 5.2v at all times WOT and closed. in any position.

also, maybe becasue of the TPS , i cleaned the IAC and i tried to set the idle, no good there either. TGO says idle at 450rpm with the car in drive with IAC unplugged. car wouldnt go below 700 before the linkage stopped. i backed the screw out further, but the linkage wouldnt roll any further back. again, .

i'm going to get a new TPS and try again. someday
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Posted By: Pocket On: 09-25-2007 @ 20:29:20     Reply | Top | Edit

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I have no idea about your IAC

After each cleaning of mine I put the cone all the way back in the motor and then cycled the key 3 times

Worked like a charm

Hopefully your TPS is the only problem you have




As for the OBII TPI, I would LOVE to have that harness
Maybe once I get into the more advanced tuning Ill learn the medothds and needs for such a thing and how to make it work
--
"If you have complete control over the damned thing, you're not going fast enough." - Carrol Smith

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Posted By: LeadFootedRacer On: 09-25-2007 @ 20:55:19     Reply | Top | Edit

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so according to lt1intake.com he'll supply me with a converted LT1 intake for the heads i suggest. but it is bored for a stock TB. is that something i can bore bigger myself? i am a machinist.

he also states that an LT4 intake wont work? i dont understand that part of this shinanigan. maybe i should just email him about this stuff huh?
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Posted By: Pocket On: 09-25-2007 @ 22:42:57     Reply | Top | Edit

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A monkey with a dremel could bore the TB opening bigger

I dont see why the LT4 intake wont work, its just bigger ports

Alot of LT1 guys swap in a LT4 intake directly right? No difference I see there

As far as I read he didnt do LT4s simply because they were expensive and hard to come by

Ask him and be sure
And while your at it, ask him about the aftermarket LTx intakes "Air gap" and such, if they can be converted


--
"If you have complete control over the damned thing, you're not going fast enough." - Carrol Smith

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Posted By: LeadFootedRacer On: 09-26-2007 @ 01:45:02     Reply | Top | Edit

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on his website he states something about coolant ports in the head that the LT4 intake doesnt cover. what do you mean "air gap"? i'm new to this LTx crap.

what are the true benifits of putting an LTx intake in a 3rd gen? i know the LT1 guys go to the LT4, and thats why i wanted to go to the LT4 intake, but other than the looks, does it really function better than a ported, polished, siamesed TPI setup?
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Posted By: Shift On: 09-26-2007 @ 09:23:12     Reply | Top | Edit

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An air gap manifold is just one of those manifolds where the runners aren't complete really with the base of the manifold, so air can run through it.


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Posted By: LeadFootedRacer On: 09-26-2007 @ 13:30:21     Reply | Top | Edit

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thats what i thought. i've owned one of those. i'll probably shoot him an email later today when i'm not so damn tired.
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Posted By: Pocket On: 09-26-2007 @ 16:06:45     Reply | Top | Edit

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http://store.summitracing.com/partdetail.asp?autofilter=1&part=EDL%2D7109&N=700+4294925239+115&autoview=sku
Airgap

Only looking at that because they do not sell replacement LT4 stuff that cheap
And Im only interested in the LT4 stuff bcause the ports are HUGE and the heads Im using have massive ports
Perfect for a future Supercharged engine

Im going LT1 because it flows more stock than a ported/upgraded TPI can
It also has much shorter runners for a raised power band. The downside is I lose some torque
--
"If you have complete control over the damned thing, you're not going fast enough." - Carrol Smith

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