Originally Posted by Datsports

sorry i have no slip . my car has run a couple of local car club drag runs . my PB is 12.72 @ 110.no prep . also have achieved close to the same no#s with dynolitios 12.74@110.
i used a drag calculator to get an estimation of HP .of just under 500bhp .
we have no local dyno here . nearest is 500km away .
no eaton roots here .
mine has the legendary OG prototype 1.7 autorotor kenne bell twin screw,
first used by a well known legend fellow forum member .
who i would think needs no introduction .
though i bought it 3rd hand .
there are dyno sheets from his XKR 4.0 on the net from way back then with only 20hp less than than my cars estimate ,his had no other mods other than the TS .
its hard for me to fathom that with 200cc more and all my mods i only gained 20hp on his no#s. though i'm not spinning it as hard as he was .
stock 4.2 eaton's run a 2.9'' top pulley at ratio 2.2:1 , mine is 2.5'' running at ratio 2.554:1

i do have some other pulleys to spin it faster still , including the original one used in testing a 2.16'' upper . or NOT AND a eurotoys lower one i will fit in the future .
BOTH these together will brake something for sure !
the stock injectors are max'ed out at 500-550bhp . and no one does a tune for the DENSO. except the canned chip tunes available .
but as soon as i state my mods they retract the availability .
BTW the Denso map is the same as the Denso 04-05 XJR .

Originally Posted by AlexJag

I suspect it's the same mapping as in my Denso ECU would have to verify it. Can tune it past 500 crank not proble, this is with a stock m112 Eaton , so I think it deserves a little more credit than people think our superchargers can handle..
What's the benefit of the EGR delete on your car?

Originally Posted by Datsports

I would not think it’s the same map . Mostly because of the fact you have duel MAF and vvt.
the early STR/XJR do not .

no one said the Eaton M112 was not capable of making good power .
in-fact as you said the opposite has been well proven ,
however it is not capable of making Good power for very long.
two back to back 0-100mph runs And it falls on its face.
as it just makes too much heat which results in timing retardation then you’re back to square one.
With less power than even stock.
Especially in an already hot environment.

as for the EGR bypass there is no more soot and crap in my charge coolers, Throttle body , elbow & supercharger .

Originally Posted by Dave Swaine

Originally Posted by Datsports

yours is reading two MAFs , for sure it's different .
truthfully the single intake does ok . with the caldoofy pipe .
mine makes 17psi through it . the eaton would melt doing that with any intake .
14.8psi was the highest my m112 would pull with a 1.5 powerhouse pulley . which reduced to 14.2 with cat delete .
boost is most certainly propped up on both sides of the blower .



i know there is no timing retard with this mod on my car . also you can turn off the monitors in your tune to complete this mod .

no mine is a stock tune no alterations . still has the monitor . the light comes and goes depending on driving characteristics .
i also know there is a small power reduction from this mod , as the combustion temps were optimised to have EGR in the tune .
but i think the retained cleanliness of the in-take far out ways the small loss in power/efficiency .
i know EGR has a job to do , and does it well when new .
But i think EGR does more harm than good on a high milage engine.to both the engine and the environment

Originally Posted by Dave Swaine

Originally Posted by AlexJag

Interesting on your boost levels , with 1.5lb pulley I was at max 12.6 with high flows and down to 11.7 after gutting them , and this is at Sea level , so if your numbers are correct I wonder where the extra boost came from. It could be a restriction in exhaust or crank pulley ratio is different.
Btw when my high flows melted my boost was as high as 13.5

Originally Posted by AlexJag

Interesting on your boost levels , with 1.5lb pulley I was at max 12.6 with high flows and down to 11.7 after gutting them , and this is at Sea level , so if your numbers are correct I wonder where the extra boost came from. It could be a restriction in exhaust or crank pulley ratio is different.
Btw when my high flows melted my boost was as high as 13.5

Originally Posted by Datsports

. im reading that from the charge hat were the fuel pressure regulator reads from .
as AVOS suggests .

Originally Posted by jackra_1

Where is that located and what do you use to measure?

Originally Posted by avos

Just follow the rubber tube from the Supercharger exit manifold (on all 4.0/4.2 models in the rear/right hand side of the manifold)

Originally Posted by Datsports

there was no "extra" boost . stock speck is 13.6 psi for the 4.2 . mine read stock 13.2 or slightly higher in cold weather when stock .
the 1.5 pulley put it over 14.xx psi off the bat . im reading that from the charge hat were the fuel pressure regulator reads from .
as AVOS suggests .

Originally Posted by AlexJag

Im using SDD or any obd2 reader. Those are the numbers I get . How are you reading yours?

Originally Posted by XJR-99

My ported heads. Cams are more important / bigger gain mods than heads.