1952 Chevy Vette Farm Truck Build

[lower50's]

Yup he looks super happy. As I'm sure your proud.

[FarmerSid]

Not much progress on the truck. Finished parting out the roadmaster. Made some serious $$ to put towards the 52. So with a few bucks in hand, I ordered a RnD rad. Found a early 70's chevy van steering column that has tilt, shift indicator, column shift with no key. Will pick it up in a few weeks on my way to an out of town hockey game.

Now that I have a few bucks burning a hole in my pocket, I need to get a brake booster and master cylinder setup. Been looking but info is starting to get confusing. I'd like to go firewall mount and something that is nice looking.

Would you sharp cookies here mind helping me selecting something that will work for my setup? It would be greatly appreciated.

[solidaxel]

Have you looked into a Hydroboost for your brake system because you have power steering??

[FarmerSid]

A bit solid but don't understand it all. I understand low vacuum is better suited for hydroboost but have no idea if I will have low vacuum or not. Not sure what came on the truck the engine came from. Like I said, this is all French to me. I don't mind a firewall setup as long as it's sharp looking and will work with my vette calipers. Vette masters and boosters aren't the best looking imo.

I don't have a brake pedal yet either so should I be salvaging that setup from the roadmaster?

See I told you all I'm a little slow.

[Advanced Design]

Sid, in 99's last build he salvaged a brake pedal assembly from another vehicle and used it. It might have been an S10 though I don't remember for sure. I did the same for my 35 Chevy build and it was a lot of hours in fabrication time to make it work. This time I think I will make use of one of the kits...just haven't started researching which one.

[solidaxel]

You pick up things very fast!
I have the same calipers and rear end on my new project, and Hydro boost is just two more lines, P/s to HB, HB to R&P R&P to P/S pump, circuit complete!

[FarmerSid]

Thanks AD. I saw 99's build. I look at it all the time. Don't mind fabbing the under the dash stuff. Just want a better looking unit under the hood.

Thanks Solid. Lowers also mentioned about the hydroboost. Does it make the under hood look ok? Why are you going that route?

[99 to Life]

I like the firewall setup to be honest. I like seeing a nice clean set up. I'll be trying a wildwood MC on my current build. as for the pedal, I'v used an s10 pedal and also a Silverado pedal. the Silverado pedal was better bc it was taller, so mounted higher. but unless I have a pedal out sitting there, I'd just buy a wildwood brake pedal.

[JJorgensen52]

Originally Posted by FarmerSid

Thanks AD. I saw 99's build. I look at it all the time. Don't mind fabbing the under the dash stuff. Just want a better looking unit under the hood.

Thanks Solid. Lowers also mentioned about the hydroboost. Does it make the under hood look ok? Why are you going that route?

The unit is a lot more compact, and it has a much more consistent pedal feel if you do have a lot of vacuum variation. Your LS motor most likely had factory vacuum brakes.

That said, in my opinion anyway, they're not good to look at, too many extra hoses and pipes. I'd prefer the single vacuum line to the booster. I'm currently working around an 11" S10 dual diaphragm, but there was a 9" dual diaphragm heavy duty unit (In the 92 S10 it's option JM5) which is compact and not bad to look at :
http://www.cardone.com/Products/Prod...=501221&p=rock

It will work with the later straight bore masters that GM used in four wheel disc S10s (I'm using the one from a 2000 Blazer)

As far as the pedal goes, I used an S10 bracket, but it wasn't exactly a bolt in, I had to modify the bracket and extend the pedal about 2.5" to be where I was happy with it.

[lower50's]

Sid this is my Hydro booster I'll get a pick tomorrow night with it all together. For brake peddle I used '80's gm van bit of trimming fit really well, then put a support to dash. I'll get some picks of that too. Might help.

[lower50's]

Got the picks Sid. Hydro and peddle. Hope it helps with your decision. The last pic is looking through the left gauge hole you can see the placement and reinforcement.

[FarmerSid]

Thanks Lower! Appreciated. Gotta do some more research. More to it than I thought. Was kinda hoping I would have had more feed back but I'm definitely learning up on this stuff.

[solidaxel]

Sid You learn very fast !
Look how long it took you to learn L S!!

[FarmerSid]

Ready to order the electric fan for the rad. Looking at a Spal 16" Puller Fan. #30102082. Anybody have any other options? Also, do I need to get a relay kit with it? I think my 04 PCM controls the fan. Enlighten me all! Thanks!

[JJorgensen52]

Originally Posted by FarmerSid

Ready to order the electric fan for the rad. Looking at a Spal 16" Puller Fan. #30102082. Anybody have any other options? Also, do I need to get a relay kit with it? I think my 04 PCM controls the fan. Enlighten me all! Thanks!

I have a Derale 18916, very similar fan.

Your PCM is capable of controlling the fans, but I don't think in an '04 would have that programmed so you would need to have it added when you do the reflash.

The fan is controlled using a ground trigger, so you will need to use a relay - the PCM grounds the coil on the relay to turn it on, and that's what activates the fan. There's a single wire you have to add to the harness coming from the PCM for this function, if the donor truck didn't have E-fan to start with.

**EDIT**
Check out this link, here:
http://www.lt1swap.com/2004vortec_pcm.htm

That shows the pin-outs for the 2004 PCM - the wire in question goes to pin 42 in the blue connector C1 (the pin is highlighted in blue as well).

I can't remember, were you going to modify the harness yourself, or buy one of the modified ones?

[FarmerSid]

Thanks JJ. So the relay kit will plug into the stock engine harness? The temp sensor on the engine block goes to this relay kit too? Sorry for the dumb questions!

[JJorgensen52]

Originally Posted by FarmerSid

Thanks JJ. So the relay kit will plug into the stock engine harness? The temp sensor on the engine block goes to this relay kit too? Sorry for the dumb questions!

No such thing as a dumb question when it comes to wire harness, they're confusing as all get out

The relay kits (say you bought the SPAL FRH one, like this one) are set up to run power direct from the battery to the fan. There will be just one wire (the relay coil ground wire) which gets connected to your engine harness, via the pin 42 shown in the PCM pinouts.
You're going to have to add a pin to that position on the connector - but lucky you, you have a some extras you can remove from the connector for other functions you don't need, so you can just use one of those and solder to your relay ground lead

I may possibly have one of those PCM connectors in my pile of extra parts laying at the house, if I do I can snap a few photos of what I'm talking about.

[ricott]

Originally Posted by FarmerSid

Thanks JJ. So the relay kit will plug into the stock engine harness? The temp sensor on the engine block goes to this relay kit too? Sorry for the dumb questions!

If you want the PCM to control your fans, it must have a "tune" in it that has the fan files. Truck tunes did not have a “fan” setup until like 06 (I think). I’m assuming you have the “Drive by Wire” setup (PCM has the BLUE/GREEN connectors since you said the motor was an 04 truck. I usually program the PCM using a 2000 or 2001 Corvette “tune”. This tune has the “Drive by Wire” and electric fans in it. If using a “Drive by Cable” setup (RED/BLUE PCM connectors), use a 2000 or 2001 Camaro tune.

Once you have a tune that has electric fans, all you have to do is hook the ground wire from the relay to the proper wire into the PCM. When the temperature switch that feeds the PCM sends the right signal, the PCM will ground the fan relay wire and the fans come on. Hope this helps.

[Advanced Design]

Sid, we did basically the same for tune and cooling fans on my 56. The pcm from the harness supplier had a truck tune which didn't work on the dual fans. Reprogrammed with 01 F car.

[solidaxel]

Take a look at some of the Jeep electric fans, I do not have any part numbers in front of me, but the ones I use are large and work very well here in the heat with A/C

My Howell harness came with a relay and the his computer was "tuned" for a electric fan.
It turns on at 205.8* and off at 195.4*
the fan hooked up with a + & - wire supplied with a connector

[FarmerSid]

Originally Posted by JJorgensen52

No such thing as a dumb question when it comes to wire harness, they're confusing as all get out

The relay kits (say you bought the SPAL FRH one, like this one) are set up to run power direct from the battery to the fan. There will be just one wire (the relay coil ground wire) which gets connected to your engine harness, via the pin 42 shown in the PCM pinouts.
You're going to have to add a pin to that position on the connector - but lucky you, you have a some extras you can remove from the connector for other functions you don't need, so you can just use one of those and solder to your relay ground lead

I may possibly have one of those PCM connectors in my pile of extra parts laying at the house, if I do I can snap a few photos of what I'm talking about.

Thanks JJ. That kit is what I was told I would need with the Spal fan. I will look for the PCM pinouts in the meantime. Don't laugh but the PCM gets an input from a temp sensor somewhere on the block which in turn sends a signal to the fan relay to turn the fans on?

Thanks again. Haven't yet got to where I need to rework my harness.

[FarmerSid]

Originally Posted by ricott

If you want the PCM to control your fans, it must have a "tune" in it that has the fan files. Truck tunes did not have a “fan” setup until like 06 (I think). I’m assuming you have the “Drive by Wire” setup (PCM has the BLUE/GREEN connectors since you said the motor was an 04 truck. I usually program the PCM using a 2000 or 2001 Corvette “tune”. This tune has the “Drive by Wire” and electric fans in it. If using a “Drive by Cable” setup (RED/BLUE PCM connectors), use a 2000 or 2001 Camaro tune.

Once you have a tune that has electric fans, all you have to do is hook the ground wire from the relay to the proper wire into the PCM. When the temperature switch that feeds the PCM sends the right signal, the PCM will ground the fan relay wire and the fans come on. Hope this helps.

Thanks ricott! Helps a lot! I don't know if I want or should or shouldn't run the fans from the PCM. Up for what ever works. Pretty sure my 2006 engine had a mechanical fan. The harness and PCM is from an 04 and is DBW. Would you be able to supply a tuned PCM for my setup? Maybe jumping the gun but thought maybe I should ask.

[FarmerSid]

Originally Posted by Advanced Design

Sid, we did basically the same for tune and cooling fans on my 56. The pcm from the harness supplier had a truck tune which didn't work on the dual fans. Reprogrammed with 01 F car.

Thanks AD. Starting to understand this stuff a bit now. I now have some info on what I will need to do to my harness.

[JJorgensen52]

Originally Posted by FarmerSid

Thanks JJ. That kit is what I was told I would need with the Spal fan. I will look for the PCM pinouts in the meantime. Don't laugh but the PCM gets an input from a temp sensor somewhere on the block which in turn sends a signal to the fan relay to turn the fans on?

Thanks again. Haven't yet got to where I need to rework my harness.

Yes, the PCM is using the sensor in the front of the passenger's head, near the #1 exhaust port, to measure engine temperature. It turns the fan on and off based on pre-set thresholds in the tune. Factory numbers are something like 224*F on and 202*F off, if I remember correctly.

[FarmerSid]

Originally Posted by solidaxel

Take a look at some of the Jeep electric fans, I do not have any part numbers in front of me, but the ones I use are large and work very well here in the heat with A/C

My Howell harness came with a relay and the his computer was "tuned" for a electric fan.
It turns on at 205.8* and off at 195.4*
the fan hooked up with a + & - wire supplied with a connector

I did look at the jeep fans as you suggested to someone else. I don't think I have enough room for them. Thanks for chiming in with the info.