From knowing nothing to having a Thunderbird supercharger on an m20b27i

[Ether-D]

So here's the thing. My "blue" top 24.5 lbs injectors turned out to be green tops that the yellow tint had faded out of. So they were just 15lbers out of a m50. Glad I didn't use those.

So I now will have to buy injectors, and since I'm buying them I'll go ahead and shoot for some 30+lbers so I won't have to buy another set when I pulley up. I'll go to pull a part on Sunday and see if I can score a set.

So, a slight delay it appears. Damn I was so happy last night when she started. Now I gotta wait some more. It'll be worth it.

[TheTacoMan]

I was maxxing out my duty cycle with 30lbs at 12psi just to warn you, its worth them a bit bigger.

[Ether-D]

Got it. I'll look for 40somethings.

[The Dark Side of Will]

I was maxxing out my duty cycle with 30lbs at 12psi just to warn you, its worth them a bit bigger.

Got it. I'll look for 40somethings.

Sounds like 36's would work fine for you.

Dialing in injector dead time is tough, and it's tougher with larger injectors.

[Q5Quint]

It is less tough when you use somebody else's tune that idles properly with injectors nearly 2.5x as large as stock.

You do want 2.5x the hp of stock, right?

I dont know this seller but it was a quick search: http://www.ebay.com/itm/Green-Giant-...-/300997245075

[The Dark Side of Will]

The terminology is different for different engine management, but "offset" or "dead time" can vary significantly among different types of injector with the same nominal flow rate, even sets with matched flow rates.

So if he uses a different type of injector than the tune was dialed in for, the work of dialing in the dead time has to be redone.

Injector dynamics sells sets with matched flow rate AND dead time, but they're *NOT* cheap.

[Ether-D]

Well, it has to start out cheap. I can't buy anything else for a while. Especially *not* cheap stuff. Hopefully pullapart will have some…

Edit: Also, no, I don't want 2.5 times factory HP, that's 420hp. 1.5-1.8 times factory HP will be juuuust fine. That's about 250-300.

[george graves]

Well, it has to start out cheap. I can't buy anything else for a while. Especially *not* cheap stuff. Hopefully pullapart will have some…

Edit: Also, no, I don't want 2.5 times factory HP, that's 420hp. 1.5-1.8 times factory HP will be juuuust fine. That's about 250-300.

400HP in an e30 is way too much for a daily IMHO. With a super charger vs turbo - that's a totally different story. Then that HP becomes usable. PS - take more pics.....

[Ether-D]

400HP in an e30 is way too much for a daily IMHO. With a super charger vs turbo - that's a totally different story. Then that HP becomes usable. PS - take more pics.....

400hp is too big, maybe waaaaay too big, for me.

I thought I was wearing you guys out a little with the pics. I'll put some tighter shots up later.

[TheTacoMan]

I remember a time where we all said, 5-6 psi just a little boost.
Its an addiction, 1 psi at a time.

[Q5Quint]

Stock clutch shreds at 250hp
Stock ecu can only handle about 250 with bigger injectors.
300-350 or so with a chip, piggyback timing retard, + fmu TCD style.
Dont forget your head studs.

After 250hp you need a new ecu/piggyback, clutch, and injectors, and a turbo/supercharger. After 250hp it will be about the same cost to you no matter if you have 250 hp or 400hp. You might have a different size turbo or supercharger, but the equipment needed will be the same.

This is why people go ahead and buy 42lb injectors instead of 24lbers. I think I was maxing 24lbers out at 10psi shredding the stock clutch.

Here is a log of 24lbers at 82% at 150 map (about 7 or 8psi at just 4700rpm)



If you already have megasquirt there is literally no reason to not run 42lbers, other than trying to save $75 bucks. The thing about running out of fuel, or having an injector stick open, is that the result is usually worse than $75$ of trouble.

That said I found a set of 32lbers for like 50 bucks on ebay and cheaped out- if it was a turbo I wouldnt bother and go straight to 42s, but with a supercharger I doubt we will get over 12psi and need more than maxed 24lbers.

The megasquirt calculator gives me 327 hp with 6 32lb injectors. That is fine by me.

http://www.megamanual.com/v22manual/minj.htm

245hp with 6 24lbers btw.

173 with 6 17 lbers.... which is exactly what your car came with stock, hence why mods want bigger injectors.

[whodwho]

42lbs from a member - http://www.r3vlimited.com/board/showthread.php?t=313181

[Ether-D]

I gotta hit pull a part first. If I strike out there, I'll just have to save for a few more weeks.

[TheTacoMan]

Dont cheap out on injectors its worth it getting new ones to avoid tuning issues as I did with used 30lb injectors. I replaced them with new ones and tuning, drivability was instantly better.

[akorcovelos]

this is seriously motivating me get back to work on the m90 and ms3x sitting on my shelf. Nice work so far! I have to agree with a few others that the PC hardware needs to go for proper automotive equipment, but at least we can prove it now!