🔧 BUILD Upside-down M90 GTP build thread

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When your wife gives you permission to build a racecar, you build a racecar.

This is what happened to me. However, all funding for this project comes out of my construction account. I really need a telehandler, so this is very budget friendly. Luckily, I've been stockpiling parts for years. This isn't an overnight build by any means. My goal is to make a 1/4 mile pass with it before the tracks close for the season. I'm taking a risk here and using photobucket for image hosting, so hopefully they don't screw me over again.

So let's start it off. I bought a 04 L26 motor with somewhere north of 100k on it and started to tear it down.

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Everything looks good so far. The pistons are really clean. There was some junk sitting in the oil pan, but not much.

GTPpower

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Video from the Dyno day on Sunday. Power was pretty weak, but thanks to all the local friends that were there, I had lots of eyes to help me watch it. We found out the bypass is not closing. I'm not sure how it's even making boost, but at least now I know the problem why it's not making the power it should. So, now I'm going to weld that shut, install a bov, and I'm about 97% sure that I'm gonna to fix the transmission myself.

 

10sec

I haz dat teddy bear smile.
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I would imagine the drive losses would be insane if there was a way to spin it that fast. I also don't think he was seriously asking. I think the sound of your setup is so unique it'll have people thinking you're running a super small pulley. They certainly won't take the time to read anything you put in the description, TCG and the world, does not read.
 
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Mr_Roboto

Doing the jobs nobody wants to
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I would do it as 2.70/1.05 which is around 2.58". I may be off on this but I think the ratio should be simple being based on linear distances. I would go up on driven pulley size vs down on blower snout pulley size if plausible just due to the belt area up top being small.

Based on a 6.94 stock crank pulley diameter*1.05 divided by 2.7 I get a ratio of ~2.7:1. How odd it worked out evenly like that. You'd be looking at what 16.2K if you were spinning the engine up to 6 grand. Off the sheet if I remember right.
 

GTPpower

TCG Elite Member
Jun 5, 2012
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Nebraska
I would imagine the drive losses would be insane if there was a way to spin it that fast. I also don't think he was seriously asking. I think the sound of your setup is so unique it'll have people thinking you're running a super small pulley. They certainly won't take the time to read anything you put in the description, TCG and the world, does not read.

Ah haha. Ok that makes sense.
 
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GTPpower

TCG Elite Member
Jun 5, 2012
6,295
9,611
Nebraska
I would do it as 2.70/1.05 which is around 2.58". I may be off on this but I think the ratio should be simple being based on linear distances. I would go up on driven pulley size vs down on blower snout pulley size if plausible just due to the belt area up top being small.

Based on a 6.94 stock crank pulley diameter*1.05 divided by 2.7 I get a ratio of ~2.7:1. How odd it worked out evenly like that. You'd be looking at what 16.2K if you were spinning the engine up to 6 grand. Off the sheet if I remember right.

Yeah, it's easy to figure blower rpm.

I would like to go bigger on the crank, but the ati 10% balancer is like $600.

I found someone selling one with a 28% od pulley, which is around 10". So I could run a big upper and not worry much about belt slip, but I'm not sure that would even clear my subframe.
 
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