Blasphemy101's E30 Build Thread

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Re: Blasphemy101's E30 Build Thread

Postby M20_fever » Thu May 15, 2014 3:47 am

rule of thumb is 100hp per 10lb/hr, so 42lb/hr should be good to around 420hp. Obviously thats a huge generalization that doesn't consider the tune or other mods, just what the injectors are capable of flowing.
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Re: Blasphemy101's E30 Build Thread

Postby Yoshi » Thu May 15, 2014 11:16 am

Also number of cylinders and type of injection. IIRC a V8 thunderbird from back in the day ran off two 60lb injectors at the top of the intake.
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Re: Blasphemy101's E30 Build Thread

Postby blasphemy101 » Thu May 15, 2014 1:31 pm

They should arrive within the next couple of days, so I'll see. I'm certainly not going to complain about a low duty-cycle.
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Re: Blasphemy101's E30 Build Thread

Postby Yoshi » Thu May 15, 2014 2:15 pm

You will if it's so low that there isn't proper atomization and your idle is shit.
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Re: Blasphemy101's E30 Build Thread

Postby blasphemy101 » Thu May 15, 2014 4:17 pm

I don't think that will be a problem. They're big, but not that big...
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Re: Blasphemy101's E30 Build Thread

Postby Yoshi » Thu May 15, 2014 5:06 pm

Agreed.
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Re: Blasphemy101's E30 Build Thread

Postby M20_fever » Fri May 16, 2014 1:08 pm

Yoshi wrote:Also number of cylinders and type of injection. IIRC a V8 thunderbird from back in the day ran off two 60lb injectors at the top of the intake.


True, same setup I run on the Chevelle.
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Re: Blasphemy101's E30 Build Thread

Postby Yoshi » Fri May 16, 2014 1:23 pm

Carb < throttle body injection < port injection < direct injection
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Re: Blasphemy101's E30 Build Thread

Postby blasphemy101 » Fri May 16, 2014 2:50 pm

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Woo! Got everything installed last night.

I torqued the studs in 3 stages - 25 lb*ft-->Wait 15 min.-->50 lb*ft-->Wait 15 min.-->70 lb*ft

I adjusted the required fuel setting for the injectors, and the car started right up. It's running pretty lean at idle, and REALLY lean at some spots under 2500 RPM. Obviously, I didn't want to push the car, but I let the RPM come up to about 4500, and everything 2500-4500 rpm looks like it's going to be a little rich.

I plan to check the head studs' torque, since they've been heat-cycled once, and then I'm going to try and get a solid tune down tonight. Autocross tomorrow, and then I'll check the torque one last time.
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Re: Blasphemy101's E30 Build Thread

Postby blasphemy101 » Mon May 19, 2014 1:28 pm

...aaaand my car makes clouds. Not the good kind, either. Blown headgasket - or at least I'm 98% sure. If I have time tonight, I'll do a compression test to be sure.

My tune looked okay - 20 deg of timing at its highest point. Data logs were good throughout the day as well; my AFRs were in the 11.5-11.9 at peak boost. Of course, this was one of my last runs, so I don't have a datalog of the point at which the head gasket went.

Towards the end of the day, it felt like the car was getting down on power, but I just chalked it up to me getting used to the new power.Turns out I was probably wrong - someone told me the had seen the car pushing a small amount of white smoke during my runs. I wish someone had told me sooner -.-

Man, 15 psi was fun...
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Re: Blasphemy101's E30 Build Thread

Postby Yoshi » Mon May 19, 2014 3:34 pm

Need a pro tune son.
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Re: Blasphemy101's E30 Build Thread

Postby blasphemy101 » Mon May 19, 2014 5:46 pm

Yoshi wrote:Need a pro tune son.


That's the best solution. Of course, I'm sure 10 PSI on stock head bolts didn't help. I have run the car seriously hard since I got it on the road; something had to give eventually.

It's frustrating for this to happen on my first day out, but I'm more curious about what went wrong/failed (aside from the HG, obviously).
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Re: Blasphemy101's E30 Build Thread

Postby blasphemy101 » Mon May 19, 2014 7:57 pm

Question - do you have to replace the timing belt or tensioner if you remove it/relieve tension from it? I replaced the timing belt <10k miles ago. No point in replacing either if I don't have to.
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Re: Blasphemy101's E30 Build Thread

Postby Yoshi » Mon May 19, 2014 11:01 pm

I'd reuse the tensioner.
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Re: Blasphemy101's E30 Build Thread

Postby blasphemy101 » Tue May 20, 2014 12:10 am

Yoshi wrote:I'd reuse the tensioner.


Sounds like a plan. If they should both be replaced I'll order them both, but if I don't need the tensioner, that's ~$30 that can go towards other things. I'm planning to upgrade to the newer style cooling system in the process.

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