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How did you get the stock LH to work with individual throttle bodies? I assume you eliminated the MAF and replaced with a MAP sensor, then tuned with a Sharktuner?
I have installed a freely programmable computer, the original one has been removed
Did I miss an earlier thread which describes what was done to this car?
If not, it would be helpful knowing what mods were made.
And I agree, 340 rwhp is not very good for ITBs knowing that Alex and John did 430/450 rwhp with their 5.0 manuals.
engine is completely original, I only set up itb's and a programmable computer. 340 is still too little. I hope to find 40 horsepower. but I find it hard to believe 450
I have installed a freely programmable computer, the original one has been removed
Now this gets more interesting each day. I am in just such a process on my ex-CIS 1978. Perhaps Barry told you because he sold me the intake parts of his old engine. I would really like tyo come and see / talk to you about your conversion. When it's allowed of course.
Now this gets more interesting each day. I am in just such a process on my ex-CIS 1978. Perhaps Barry told you because he sold me the intake parts of his old engine. I would really like tyo come and see / talk to you about your conversion. When it's allowed of course.
Pretty sure that if you do enough "dyno shopping", you can have that with a stone stock engine.....
Gregg, I can get in there. but i want to keep it cheap. I also want the optical to look good. after all, it is not a race car but a car to drive to the bakery. also. my inlet stack's are too short actually. officially they are for an engine that spins 9000 rpm. I have no place under the hood.
12:1 compression
100.5mm JE Pistons on 2R rods and a GTS crank - call it 5.5ltrs
Colin's cams
968 intake valves in ported heads and
928 Intl headers
X-pipe
E39 M5 ITBs with M5 long trumpets
33lbs/hr Ford Motorsport Injectors
Pace products dry sump
Custom flywheel
To make decent horsepower from a stock displacement 928 you need long intake trumpets. For a street car that becomes a problem of packaging. When we mapped our car, short intake runners cost us nearly 100bhp!
12:1 compression
100.5mm JE Pistons on 2R rods and a GTS crank - call it 5.5ltrs
Colin's cams
968 intake valves in ported heads and
928 Intl headers
X-pipe
E39 M5 ITBs with M5 long trumpets
33lbs/hr Ford Motorsport Injectors
Pace products dry sump
Custom flywheel
To make decent horsepower from a stock displacement 928 you need long intake trumpets. For a street car that becomes a problem of packaging. When we mapped our car, short intake runners cost us nearly 100bhp!
434rwhp
You forgot to mention the use of the jdsporsche Alpha-N system and tuned with the Sharktuner....
12:1 compression
100.5mm JE Pistons on 2R rods and a GTS crank - call it 5.5ltrs
Colin's cams
968 intake valves in ported heads and
928 Intl headers
X-pipe
E39 M5 ITBs with M5 long trumpets
33lbs/hr Ford Motorsport Injectors
Pace products dry sump
Custom flywheel
To make decent horsepower from a stock displacement 928 you need long intake trumpets. For a street car that becomes a problem of packaging. When we mapped our car, short intake runners cost us nearly 100bhp!
Alex, I have always emphasized the need for a properly tuned length of the intake duct which I know you have experience of. Over there in the new world, I see that many are running very short intake ducts. Why tune the intake duct to 9000 rpm when the engine only revs 7000 rpm? I know that it is a problem to be able to get the intake system under the hood, but if you want an optimal power curve, you have to consider modifying the hood.
I see it possible to do it in an appealing way that beautifies the car's appearance.
Åke
Alex, I have always emphasized the need for a properly tuned length of the intake duct which I know you have experience of. Over there in the new world, I see that many are running very short intake ducts. Why tune the intake duct to 9000 rpm when the engine only revs 7000 rpm? I know that it is a problem to be able to get the intake system under the hood, but if you want an optimal power curve, you have to consider modifying the hood.
I see it possible to do it in an appealing way that beautifies the car's appearance.
Åke
To be fair, the strokers made by Greg and the other guys in the US produce such monstrous torque pretty much anywhere on the curve, that fitting the shorter trumpets and shifting the torque curve up is beneficial both for driveability and also for protecting the drivetrain. However, as we discovered, stock displacement engines, even with higher compression and better breathing hate the super short trumpets. Mark Chilton - BIG GT2 on here took my ITBs further by sawing through the M5 trumpets, re-orientating them and making them fit on the side of the engine above the heads. That way he could just about squeeze an airbox on either side of the engine bay and keep the stock bonnet line as it's required by the racing regulations. So if there is a will, there is a way...
Alex, the hotter the camshaft, the more sensitive the engine becomes to the correct tuning. When you increase the engine's displacement, it behaves like if it has a milder camshaft. You also have to consider many things like intake port gas velocity which of course goes up if the displacement is enlarged.
Good that your engine is performing well and that you were able to get the entire intake system under the hood. We very much like to see a few pictures.
Åke
03-25-2021, 03:29 PM
