Yes, my IAT sensor should and will be placed inside the intake tube.

The seller of the heads I wanted to buy had a way of overstating the probable gains, so +25-30 hp would likely been the result.

Am I reading your post correctly in that you will be running approx 20 lbs of boost?

 

Hi,been a while since i posted here, did not want to be caught out again with incorrect info about TB mods possible(ET said 90mm but really meant 85mm!). I have a 1999 XKR and have just received pictures of my TB which has been modified to 90mm. TLJaguar has been working with an engineering company and have managed to complete the mods required so i get the best out of the kennybell being fitted. Should be some pictures below if i have done this right..

 

Wow, this is exactly what I've been wanting to do and have been looking into with several machine shops. Would they consider offering this to others? So I don't have to reinvent the wheel. Price?

 

im sure if you contact Tom at TLJaguar he will be able to help. I have no idea of the cost as its all part of a Kenny Bell upgrade but if you supply the TB i can't see it being more than £350.

 

see attached dyno sheet - water dragon also enquired about boost pressure, It made 20PSI on the day
Originally it used to make 233kw in standard trim, on the same dyno, and same operator.
List of mods
KenneBell 2.6lh - Quiksilver twin 2-1/2" exhaust - Nameless 200 cell Cats - bored T/B 82mm -- Abaco 3 1/2" MAF with proper cold air sys - Larger capacity intercooler heat exchanger and 010 bosch circulation pump, intercoolers and radiators cleaned at engine swap 500Kms prior to dyno --- engine compressions all over 160PSI at crank So for my $15,000.00US in mods and new engine, I have gained 20KW at the rear wheels. Same as everyone else, I was expecting big figures, at least 360KW

 

752Nm!!!! Whoa...That's pretty awesome.

For our non-metric friends, the numbers are ~555 lb/ft torque calculated at the flywheel, and 345HP at the wheels.

That's massive torque, but yeah what's going on with the HP?

 

Is there any other TS car out there that has ever shown a higher dyno (other than AVOS) ?

Thank you for posting your dyno. This is the first non-Avos dyno that I think has been posted.

I, for one, like to see what people are really getting.

Given the 11.9 and 12.3 1/4 mile times that SteveM and XJR-99 were able to achieve, it suggests that there may be a lot more power to be found with your current set-up somehow. Are you able to run it on a track and see the actual performance soon?

 

The car has moments -- I used to repair Ferrari's , Alfa's and Lambos --- when this car has a moment, it would pull the doors off any Lambo or Ferrari I have ever driven.
When the engine blew, I think it contaminated o2 sensors, no codes, just covered in burnt sludge, and I have had terrible readings from TPS, nothing under 1 volt and nothing over 3.9v at WOT - Since the dyno run I replaced the o2 sensors and knock sensors, I also bought a brand new throttle body from Ebay $500.00 US, which I will strip when it gets here and fit new parts to bored housing, also Whilst it has been apart I have fitted blue top solenoids and a few other springs in the trans. I wasn't present at that run, but RPM and speed figures don't match up to 4th or 5th gear, these tyres don't smoke or squeal when they spin - I have been thinking he had massive wheel spin - it used to do over 230KW with 10 PSI boost from Eaton M112 with everything else standard - and about 70% of that torque, I'll update in a few weeks, I'll take video if I get a chance

 

I am wondering a bit the numbers - specially the torque ones, which are 50Nm higher than Avos got from his 4.2 litre. 4.0 with 20PSI should give numbers ~550-560bhp and ~650-670Nm.

 

Hi just wanted to give you guys a an update on this small project. I will be writing it all up in a new thread, eventually... The price was way more than £350, way more.. the company (Roger Bywater of AJ6 Engineering) made a new TB from scratch, no boring out an old one! Once fitted to my 1999 model it caused loads of issues with tuning, It was impossible to get the fuel/air mix ratio correct, even with the bigger fuel pumps fitted. The ECU could not be programmed to work with this much bigger TB.. the work around was to reduce the air intake to 80mm, which was not the goal of having a bigger TB.

So my advise is unless you have a later model than mine and the ECU does NOT use air flow to regulate the fuel mix and your garage can modify the ECU, stick to boring out the TB to a reasonable size and don't push your luck like i did..

 

Someone dropped an extra zero from the above estimate, lol. I inquired about this throttle body from TL.

Were the problems at idle or throughout the rev range? I would think the MAF and O2 sensors are responsible for the air fuel ratio and not the throttle body. Do you think an aftermarket programmable MAF would solve the issue?

 

Hi. The MAF was programable. But no luck. The issue was not being able to get enough fuel in to make the mix correct. We up the fuel pressure to force more through but still needed about 21% more fuel to make the mix ration at 90mm correct. To do this we need to leave the injectors open for a split second longer which was not possible with the ECU I have. There is a fix coming, new after market ECU, but it's still a way off. I'll find the calc we did and post so you can see the maths behind the requirements.

 

Did you try bigger injectors?

 

Hi bigger injectors were not tried. I had decided I want to use the car while a solution other than injectors could be confirmed. I know that Tom was playing about with a new ECU, looks like he is nearly there with it now.

Calcs below..(my email to Tom)

I got one of the guys today to do flow rate analysis on an 80mm pipe vs 90mm pipe, see below

Results:________80mm_______90mm______Flow Rate % increase
ft/min (LFM)_____400_________400___________0%
m/s____________2.03________2.03___________0%
miles/hr (MPH)___4.5_________4.5____________0%
ft3/min (CFM)___86.57______109.57_________21%
m3/hr_________147.08______186.15_________21%
L/s____________40.86_______51.71_________21%

You can see that 21% more air flows through the 90mm duct.

What does this mean? i not exactly sure but i think it is this...

optimum air to fuel mix 14:1

If with the 80mm you are getting 14:1, the engine is performing as it should be. With the 90mm your mix will be something like 17:1, which ties in with you finding of the engine running lean.

Flow rate of standard 4.2 injectors


CC CC

356 388

364 396

356 388

361 392

357 388

361 392

361 392

361 392

360 392

Average flow 375

https://www.jaguarforums.com/forum/x...jectors-83425/

Based on this and the air flow rate it would suggest to me the flow rate of the injectors needs to be 21% bigger to match the 90mm air flow rate ratio, so 453 cc/min would be my guess.

When Tom measured the mix and air flow he calculated I needed to add about 20% more fuel in.. This is the plan. This year should see it happen...

 

This is a bit odd. Stock AJ26 SC injectors can give well rich side mixture up to 20+ PSI and 580bhp. AJ27 engines with 90mm aftermarket TB and stock injectors have had no problems at all ( better to confirm this by Avos ). My AJ26 injectors were tested at the same place than Waterdragons ( WD: AJ27 vs mine AJ26 ) and they were quite close each others. Please remember that the test is provided by another fluid than fuel. Fuel gives 3% better flow numbers. The safe AFR at these boost levels should be 11.5-12 . 14 and you blow your engine if run normal 98 ( EU ) or 93 ( US ). I have used 46PSI base fuel pressure and AFR 12.0 throught the whole rev range. 48PSI and it's almost too rich to run well at high revs.

I do not know what's your pulley ration, but I guess it's very high if you are in fueling problems with stock injectors and higher fuel pressure.

btw. 90mm flows 26.6% more than 80mm, but the good question is that is 90mm really needed with 4.0.....

 

Thanks for this, I will send onto Tom see what he says. I know he was talking to Avos during this as it was at the end of a KB install. Engine was changed about 16k ago to a 4.2 and Tom has just added the 2.6L KB supplied by Avos.

 

Are you running 4.0 or 4.2 injectors? If 4.2 ones, then I have no exact data for them since they work at much higher fuel pressures. Which fuel pumps do you have now? If you have 4.2 injectors and ~65PSI base pressure, you need fuel pumps which have stable flow rate still up to near 90PSI. Many pumps have dramatic flow degrease at that level and you go lean very easily - which is dangerous for the engine.

 

I don't have the flow data in front of me from where I had mine tested but the 4.2 injectors are rated at 32lb/hr at 3bar and the perform very near that. The standard AJ34 runs at 55psid, and my experience with a twin screw and 90mm TB is that you probably need a bit more than 55 but not a lot more. So have to agree with XJR, something seems a bit odd about being that far off from a safe AFR.

 

4.2 injectors: If they are 32lb/hr = 336cc at 43.5PSI ( 3bar ). They flow 378cc at 55PSI, 395cc at 60PSI and 411cc at 65PSI.

 

I am still waiting for feedback from Tom as I only advised to go with the DBX85 MAF which is tunable, am pretty sure with this MAF you can get it to work properly. Tom was working with a MAF not known to me, so couldn’t help there.

Worst case would be that you are already pegging the MAF, if that is the case (you would get fault codes), then you need for example adjust the fuel pressure, i.e. go from 43 to 55psi max (which gives about 10% more flow), and again adjust the MAF table of the DBX85 accordingly (lower the voltage output by 10%).

What airfilter setup do you have? If you go for the DBX85, I would certainly just add a plain K&N RE0920, that one gives a good flow also over the MAF itself.