85.5 944 LT1 Swap With Hydroboost

As of now I'm into the car for $5,400. Just finished my tune, after getting the swap running. Need to do something about the Intake location as my IAT's are through the roof. Also my o2 sensors are bad, or at least they have a heating up problem. They need to be heatcycled first before they do any sort of good. Heat cycling = some WOT's runs.

More pics and info to come later. Having to much fun driving her atm. Still needs painted and alot of trim parts found.

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Did you add a heated 02 circut? Pin D on the 02 sensors needs a 10amp switched wire.

spence wrote:Did you add a heated 02 circut? Pin D on the 02 sensors needs a 10amp switched wire.

I did not know that. I bought the swap half completed and finished it up. I didn't add anything to the o2 circuit. Is there a wiring diagram for the relevant bits to splice into?

Nope. I found out by reading online somewhere. When you pull all the emissions crap, you kill the power to the heated o2 circut. You need to add power back to that line. You can google it.... something will come up.

Also, this may help with you high IAT's

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spence wrote:Nope. I found out by reading online somewhere. When you pull all the emissions crap, you kill the power to the heated o2 circut. You need to add power back to that line. You can google it.... something will come up.

Darn good info. I appreciate it. Its been somewhat of a chore trying to figure out what all was used and what still needs to be hooked up. I know I need to find the heater/blower cover and the flaps. Also need to hook up the vacuum lines for it as well. Would really be nice to not always have hot air coming in through the vents.

Splash panels and wheel well liners will be nice to keep water outta the engine bay.

Did you have any cooling issues with your water temps and such? Mine seems to spike to 230 degrees every now and then when sitting. Though it will go back down to 190-210 when driving. It never goes above 230 though. It was mentioned maybe a faulty thermostat or water pump. I know my electric fans are wired atm to always be running.

Dyno results were 246.3 RWHP and 286.6 RWTq. Engine was claimed to be form a 95 vette, But i'm not sure based on the dyno results.

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I haven't drove my car yet; so I can't help you out with the temperatures... I'm using a bigger rad and fans from a V6 for contour. I just took the rad to the machine shop to get the cap welded shut. I had to cut it off because it was so tight. I'm going to be using a 160 thermostat too. Hopefully my temps will be under control.

I wired the fans like this: [You must be registered and logged in to see this link.]

Look at the harness end of the O2 sensor plugs. It'll have a Pink wire or Brown wire, see if it has 12 volts with the ignition on, If it does not it needs to. Like it was said before 10amp fuse should be good for 2 O2's.
those viper seats look good in there, how well do they fit? Do the have room to move forwards and backwards and still get to the seat belts? The reason I ask is that Kent and I bought a car that had the cheap Jap seats in it and they were huge. The e brake handle had to be bent just to use it.

Matt, I need some Viper seats, I know your out there, and they are up here some where!!!!!!!!!

Admin wrote:Look at the harness end of the O2 sensor plugs. It'll have a Pink wire or Brown wire, see if it has 12 volts with the ignition on, If it does not it needs to. Like it was said before 10amp fuse should be good for 2 O2's.

Just so i'm understanding this right, if it doesn not have 12V with ign on. Then I need to add a switched 12V wire, with a 10 amp fuse to that pin? I assume any old switched 12V source will do as long as it has a 10amp fuse added to it. Do i have to run a separate line to each O2 sensor, or will a branch off the one 10A switched line be okay?

Admin wrote:
those viper seats look good in there, how well do they fit? Do the have room to move forwards and backwards and still get to the seat belts? The reason I ask is that Kent and I bought a car that had the cheap Jap seats in it and they were huge. The e brake handle had to be bent just to use it.

Matt, I need some Viper seats, I know your out there, and they are up here some where!!!!!!!!!

Viper seats fit well. Needed to add a spacer on the inner side of each seat, but they have full range of motion front and back. The ebrake handle can still be used. I'm actually looking for some newer boxter/911, 944, 968 seats. I need to be able to access the back seats, and the vipers do not have the tilt forward latch. You can still get in the back seat, but I need to be able to put my son in the back somewhat easier than it can currently. Its a shame as the viper seats are comfy. IF you can find a decent pair of seats (preferably power/heated) I would be interested in trading or even selling the seats outright.

I used one wire and branched off it. On both o2's it was a brown wire (on my harness).

Those seats do look very nice.

spence wrote:I used one wire and branched off it. On both o2's it was a brown wire (on my harness).

Those seats do look very nice.

on the porsche harness (connector T21 14 pin) there is a bk/gn wire pin number 4. That has on its pinout, says goes to o2 sensor. Would that work to power the lt1 heat circuit?

I think pin 4 is dead when you (if you pulled) pull the DME relay. Thats the same wire that the fuel pump is run from too.

I just added another 12v switched wire onto my fuse box with a 10amp fuse.

Nice conversion!

You may have the 4.3L LT engine from the caprice.....

xschop wrote:You may have the 4.3L LT engine from the caprice.....

I may? How do you tell?

*Update*

Shes in the body shop, for a well deserved respray/ rust repair of the outside. Will be adding some side vents to the fenders and a custom intake/nose panel in order to cut down on some of the under hood temps.

If your reasonably close to columbus, ohio and are in need of a great body shop/mechanic shop "Knux rod N Custom" Is where its at. There aren't very many places i would trust with taking care of the body work for my cars.

Picked up a set of Champion RG5 Monolites, needed something to get rid of those phone dials. Looks like they will need about a 30 MM spacer or so.

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she's painted, took a while, but finally done. Not the best pic atm, but will take some more tommorow hopefully in the sunshine.[img][You must be registered and logged in to see this image.][/img]

Well done. Very nice looking and well put together.

Which Hydroboost are you using?

Now you're going to need some brakes for that beast.

This is for sale if anyone is interested.