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My official L31DETT RHD thread.


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Bryan - I see you said you got those 'cheap new turbos' for $400 for both. Are those the eBay turbos that everyone talks about, or did you just get a good deal on name brand ones somewhere?

 

If they're the eBay specials, please keep us updated on their performance/quality. It's always interesting to see how good/bad they are.

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These are cheap ebay turbos. Here is the auction I won.

 

 

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ih=020&sspagename=STRK%3AMEWN%3AIT&viewitem=&item=300179128771&rd=1

 

 

 

I have known other guys to run cheapo turbos, they say the MAIN thing is the compresser housings cracking, as SOME of them are "glued" together. You can tell which ones are glued, and which ones are fuesed by looking at them, and these that I got are NOT glued, so should be ok. We will find out anyways. Even if they dont last forever, atleast I can know if I like the ratios and size of them, then if they break (doughtful) then I will buy genuine garrets.

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Ok, so tonight I started porting on the head. I did NOT port it before, and it was in 100% stock form, as far as valves, ports, etc. Go. Here are the Flow Numbers. It took ALOT to get these ports like this. These ports are actually maxed out. There are no more restrictions in the ports what so ever, atleast not with these sized valves. With my new cams, Turbos and the increased Head Flow, I dont see how 700+ hp is out of line.

 

To give an idea, a stock P90 flows 172, my highest modified P90 flows about 225 cfm. Plus the dohc head is a cross flow.

 

Heres the numbers.

 

 

Intake Flow

 

lift Stock Modified

0.2 156.2 165.7

0.25 198.8 227.2

0.3 224.8 260.3

0.35 248.5 276.9

0.4 248.5 288.7

0.45 248.5 300.5

0.5 248.5 305.3

0.55 248.5 310.0

 

 

Exhaust Flow

 

Lift STOCK MODIFIED

0.2 146.7 151.5

0.25 170.4 182.2

0.3 182.2 191.7

0.35 196.4 198.8

0.4 201.1 208.2

0.45 201.1 217.7

0.5 201.1 222.4

0.55 201.1 224.8

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I used the same brand ebay turbo "turbocharger" on my 330hp sr20 without any problems at all. So you definetly dont have anything to worry about.

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I just looked on this page here http://users.erols.com/srweiss/tablehdc.htm

 

 

And other head flows are as follow.

 

STOCK 2jz= 225 and 142 at .5"

 

2jz M2 Systems race ported= 285 175 at .5"

 

 

PORTED RB26= 289 222 at .5"

 

7mgte stock= 180 133 at .5"

 

PORTED 7mgte= 211 145 at .5"

 

 

So Seems to hold pretty well compared to these heads.

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Bryan here is a question those flow #'s were taken with the valves in place @ .5 lift right? Is that the standard practice when measuring the "flow" capabilities of a particular head. Great work so far!!!! I live in Phoenix, about 20 mins away from your shop. I was hoping to see the beast in person would that be cool with you after you get it running again.

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So what were the valve specs on all of those heads? You probably don't want to give the specs on your DOHC Z head but what about all of those 2 valve L6 heads? I imagine that is with stock size valves w/ a 3 angle valve job?

It's cool to have some numbers just to compare heads...

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Bryan here is a question those flow #'s were taken with the valves in place @ .5 lift right? Is that the standard practice when measuring the "flow" capabilities of a particular head.

 

If you read the graph, flow was measured at varying valve lifts from 0.20" to 0.55" in 0.05" increments. And yes that's how it's generally done.

 

Nice improvement over stock, btw. Interesting that as much as that head flows stock, it was pretty much done at ~0.35" valve lift.

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