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Keaton
Joined: 02 Jan 2006
Posts: 261
Location: 85202
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 Posted: Wed Jul 11, 2007 4:44 am Post subject: |
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oh thats HOT. MORE Pics or BAN!!
what are you running in place of the CIS injectors? how much boost are you running? |
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fiat22turbo
Joined: 18 Jan 2006
Posts: 4040
Location: Portland, OR
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| Posted: Wed Jul 11, 2007 4:50 am Post subject: |
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| -nick wrote: | You really do some expert fab work! The only trouble with trying to duplicate it for a road car is messing with the hood latch / pins. Otherwise, it looks like an excellent advantage!
I'll check into adding an extra intake air temp sensor on my turbo outlet to see how mine compares. I think I typically run around 40F over ambient temp or so.
You're getting to the point where I can't even think of any tricks to add to your ride! Truly a beauty! |
Use two factory latches, one at each corner of the hood. Connect them together and you're good to go. |
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RC
Joined: 25 Mar 2007
Posts: 2637
Location: Australia
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| Posted: Wed Jul 11, 2007 8:43 am Post subject: |
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Can`t add any more myself to what has previously been said here by everyone else who admires your car.
It is an engineering marvel and at the same time a beautiful piece of art. You should justly feel proud of your workmanship and achievements.
How I wish it was sittimg in my garage.
Roger |
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bass gt
Joined: 02 Dec 2004
Posts: 971
Location: Johannesburg for now!!
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| Posted: Thu Jul 12, 2007 12:43 am Post subject: |
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| Keaton wrote: | oh thats HOT. MORE Pics or BAN!!
what are you running in place of the CIS injectors? how much boost are you running? |
Ban?? You're a hard one to please 
Regarding the injectors, the engine is full EFI running on a DTA S60 ECU. Max boost is about 1.4 bar, but i don't know whatpower it would make there. It seemed any additional boost above 1.1 bar started to give less and less power, presumably because of the air inlet temps. Hence the reason for this mod. Not for more boost, but to run less air temp, and lower boost for the same HP. as i am limited to 250 bhp in my racing class, there is little point going mad. However, purely in the interests of science, we forced the WG shut and achieved 280 RWHP at 1.45 bar of boost. This was the point the ECU's boost limit is set at, as my map sensor is a 2.5 bar absolute unit. Again, this was before this IC mod was fitted.
I would suspect, that with the car set up properly, and this mod fine tuned, 350-360 crank HP would be available. And with .7 bar boost at 3000rpm. So quite good really.
Steve |
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Keaton
Joined: 02 Jan 2006
Posts: 261
Location: 85202
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| Posted: Thu Jul 12, 2007 4:47 am Post subject: |
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| bass gt wrote: | | Keaton wrote: |
oh thats HOT. MORE Pics or BAN!!
what are you running in place of the CIS injectors? how much boost are you running? |
Ban?? You're a hard one to please
Regarding the injectors, the engine is full EFI running on a DTA S60 ECU. Max boost is about 1.4 bar, but i don't know whatpower it would make there. It seemed any additional boost above 1.1 bar started to give less and less power, presumably because of the air inlet temps. Hence the reason for this mod. Not for more boost, but to run less air temp, and lower boost for the same HP. as i am limited to 250 bhp in my racing class, there is little point going mad. However, purely in the interests of science, we forced the WG shut and achieved 280 RWHP at 1.45 bar of boost. This was the point the ECU's boost limit is set at, as my map sensor is a 2.5 bar absolute unit. Again, this was before this IC mod was fitted.
I would suspect, that with the car set up properly, and this mod fine tuned, 350-360 crank HP would be available. And with .7 bar boost at 3000rpm. So quite good really.
Steve |
yes hard to please cuz your car looks good! that orange on black makes it even hotter. were are the pics? 
i see the injectors in the throttle bodies, got that. i'm talking about the steel bradded lines that are in the CIS ports. |
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fiat22turbo
Joined: 18 Jan 2006
Posts: 4040
Location: Portland, OR
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| Posted: Thu Jul 12, 2007 4:52 am Post subject: |
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Also, the spark plugs are on the intake side? Is this just for the 931 heads?
I think he is using the CIS injector holes to create a common vacuum source for his MAP sensor and other uses. Or he has a second set of injectors for fuel or water/alcohol injection. I think it is the former instead of the latter, myself. |
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Keaton
Joined: 02 Jan 2006
Posts: 261
Location: 85202
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| Posted: Thu Jul 12, 2007 5:06 am Post subject: |
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| fiat22turbo wrote: | Also, the spark plugs are on the intake side? Is this just for the 931 heads?
I think he is using the CIS injector holes to create a common vacuum source for his MAP sensor and other uses. Or he has a second set of injectors for fuel or water/alcohol injection. I think it is the former instead of the latter, myself. |
thats what i was leaning towards, 2 & 3 are connected together and 1 &4 are as well, and they both have line that run some were. maybe to equalize vacuum. is that a vacuum can on the firewall the blow off, FPR, brake booster, and a boost controller connect to it. the lines look like they might connect to the can, but i can tell.
whats that little black line coming off the fuel rail and goes under the car? |
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flosho
Joined: 01 Jul 2004
Posts: 3160
Location: Eau Claire, Wisconsin
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| Posted: Thu Jul 12, 2007 6:18 am Post subject: |
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I *think* those vacuum take offs are for his ITB or something..
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bass gt
Joined: 02 Dec 2004
Posts: 971
Location: Johannesburg for now!!
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| Posted: Thu Jul 12, 2007 7:15 am Post subject: |
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Guy's,
The can you can see on the bulkhead is a vacuum resevoir. You're right about the braided lines. They are the vac feeds to the resevoir. The MAP sensor, fuel reg and BOV all run off of the resevoir as well.
In hindsight, i think the MAP sensor is too far away from the vac source as there is a slight stutter if you crack the hrottles open from idle. However, once above 1500 rpm, it's not an issue. And as it's a pure race car, if i let it fall below 1500 rpm, i've either parked it or crashed it 
Seems to work ok though, but i guess if i was doing it again, i might change a few things.
Keaton, i promise i will wheel it out and take a ton of pics
Steve |
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Druman
Joined: 19 Mar 2007
Posts: 419
Location: Middleport, Ohio
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| Posted: Thu Jul 12, 2007 7:40 am Post subject: |
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Steve,
Dude  , you must have the coolest looking 931 I've ever seen in my life! I've always been envyous of that orange ride of yours and wish that mine was just like it, and low and behold you have once again improved, not only the performance of the car, but also it's over all look. Genius pure genius!
(Wipes saliva from keyboard)
7osh
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87' 924S non-sunroof (Red) 45K miles
85' 944 "early" NA (Red) 130K miles
PORSCHE pisses excellence... |
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Keaton
Joined: 02 Jan 2006
Posts: 261
Location: 85202
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| Posted: Thu Jul 12, 2007 7:51 am Post subject: |
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| bass gt wrote: | Guy's,
The can you can see on the bulkhead is a vacuum resevoir. You're right about the braided lines. They are the vac feeds to the resevoir. The MAP sensor, fuel reg and BOV all run off of the resevoir as well.
In hindsight, i think the MAP sensor is too far away from the vac source as there is a slight stutter if you crack the hrottles open from idle. However, once above 1500 rpm, it's not an issue. And as it's a pure race car, if i let it fall below 1500 rpm, i've either parked it or crashed it
Seems to work ok though, but i guess if i was doing it again, i might change a few things.
Keaton, i promise i will wheel it out and take a ton of pics
Steve |
is there a design reason for the separate lines for the vacuums that I'm not understanding, other then its the firing order and maybe cost? wouldn't have easer to put a tube to connect them, like a fuel rail.
you duct should help, Le Mans C6r. some how they still managed to fit a 7L V8 under there with that shallow curve . can you say tight fit?  |
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bass gt
Joined: 02 Dec 2004
Posts: 971
Location: Johannesburg for now!!
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| Posted: Thu Jul 12, 2007 10:01 am Post subject: |
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The reason i linked all 4 cylinders up was i monitored the MAP sensor value with just 1&2 cylinders hooked up and it seemed pretty lumpy. So by linking all 4, it seemed to smooth out the MAP signal, which obviously helps the ECU control the engine better.
If i were to do it again, i would simply fit a small barb into each ITB runner after the throttle plate and link them up. But as i said, this has all been a learning curve for me, so i guess some of the solutions may not be as elegant as they could be. But then again, i didn't fancy wrecking the inlet manifold as these are pretty hard to come by.
Hey ho 
Steve |
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daveo
Joined: 02 Sep 2005
Posts: 183
Location: GB
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| Posted: Sun Jul 15, 2007 10:00 am Post subject: |
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steve
love the car
cars looking good to good makes my car look like chit, top job,
do you need some track time ? im at brands (hopfully) this thursday, astom martin track day but i know a man that can if u get my drift, taking the 24 (white racer) down if they let me,
i will call on monday to sort it out r u up for it?
Dave |
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special-tool
Joined: 08 Jul 2005
Posts: 64
Location: Bethel, Ct.
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| Posted: Sun Jul 15, 2007 9:54 pm Post subject: |
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yeah-that is beautiful.
Nicest pull I have seen on these.
How high do you run that engine, Bass?
_________________
951 566/485 HP/TQ at the wheels - pump gas
924S GTR conversion project
Honda 250R- PWK 35mm flat slide, 205 static, Boyesen, Wiseco, DG front/back, Uni, 14/42, |
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emoore924
Joined: 13 Apr 2004
Posts: 2822
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| Posted: Wed Jul 18, 2007 6:38 am Post subject: |
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Great job. One of the nicest I've seen.
If you're interested in drawing even more air through the i/c, you can introduce a small wing/lip just ahead of the opening...
____/ ____
Rather primitive diagram, but you get the idea... |
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