More boost = more HP ???

[valmes]

I edited my previous post to list all the mods...

BMW lost two times... second time the owner switched off the traction control, cause he thought it was killing performance somehow... and spun the tires at the start trying to get a grip... he lost about 3-4 car lengths at the end again!

Legnum, on the other hand, just "disappeared" from the start!!!

Starting from 7400 RPM on twin plate m/c clutch/flywheel combo - is something you gotta try!!!

[bradc]

4wd really does help, as would the 7400rpm launch

[Legnum Breaking]

Do you have 60ft times?

I found launching at about 3300rpm more than adequate, at 3600rpm there was just way too much wheelspin and the 60ft times dropped by 0.3 seconds. This was with ~450bhp available.

[valmes]

No we don't have 60ft times.
There was no wheelspin. It just took off...

[Louis]

Excellent info, well done, can't wait to see what yours can do!

[Legnum Breaking]

There was no wheelspin. It just took off...

Sounds like you need more power

[valmes]

Sounds like you need more power

Dave, that wasn't my car. Mine is slowly getting there. At the moment, the boost is set to 1 bar and it runs great, except for blown intercooler hoses... small things have to be improved upon and thats what I am doing right now.

[Legnum Breaking]

Dave, that wasn't my car. Mine is slowly getting there. At the moment, the boost is set to 1 bar and it runs great, except for blown intercooler hoses... small things have to be improved upon and thats what I am doing right now.

Thats fair enough........I thought the 7400 launch was in your car?

[valmes]

Well, if you put it this way... I did try to launch mine from 7400, but I guess I love my car too much to do it often... I just can't force myself to abuse it in this way.
However I think I will have to, Just need to know what will brake next

[valmes]

Set boost at 0,8 bar on Apexi AVC-R.

Quick spike to 1,04 bar and then settled down to 0,88 - 0,84 and held all the way to red line.

Terrible start, 0-100kph in 5,89 sec... - a whole 0,5 sec could be saved right there or even more...

Bad shifting again, probably lost a total of 0,3 sec, due to the fact that I hit rev limiter 3 times in 1st, 2nd and 3d gear (btw rev limit is at 7400 rpm)... Didn't really had to change to 4th, but that was just a test run.

With all of the above managed 13,27 in 1/4 mile run. I feel that fuel and ignition isn't really where it needs to be yet, but I don't want to rush things. Fuel set at 11,4:1 and ignition is retarded across the board.

I am confident that even at this boost level 0,84-0,88 the car can get into upper 12s with better start and shifting. Probably 12,5s there with better fuel and ignition maps. That's on 98 octane fuel (I think its something like yours 95 octane) and boost alone in a full weight car!

PS: I was under the impression that I ran at 1 bar, until I checked my settings on AVC-R (0,80 bar with duty of 35) and then looked at the EMU logs to find out that it was briefly spiking to 1,04 and then settled back to ~0,84~0,88. I need better FPR to run higher boost. Right now I am past the "sensible limit" of fuel pressure at boost.

[Wodjno]

Are you using the A/F Target Map on your EMU

[valmes]

Are you using the A/F Target Map on your EMU

I did, initially, but not right now. It did scare the hell out of me when I stepped on the pedal and car started shaking violently... the WB sensor wasn't warmed up and showed 0. EMU decided that 0.0:1 must be too rich and started pulling fuel from the map at an alarming rate. So you got to be careful with this or better be absolutely sure in your WB... and after couple of WBs going out due to some unknown reasons I just can't trust them too much. Although it is a great feature to create a rough map to work on.

[Legnum Breaking]

Didn't really had to change to 4th, but that was just a test run.

I was in 5th when I ran 12.4???? How fast was your terminal?

[Wodjno]

I was in 5th when I ran 12.4???? How fast was your terminal?

Why was you in 5th ?? Was you driving in Tip or Auto ?

[valmes]

I was in 5th when I ran 12.4???? How fast was your terminal?

I didn't really pay attention to speed... Will do next time.
I think it was around ~175-180 kph.
Terminal speed IS the best indication of available power... What traps did you ran Dave?

[Legnum Breaking]

Why was you in 5th ?? Was you driving in Tip or Auto ?

Manual, the gears are a lot shorter. Top of 4th is about 108-110mph

[Wodjno]

Manual, the gears are a lot shorter. Top of 4th is about 108-110mph

Reckon there a bit to short for Drag ? Thats 4 gear changes in 12 seconds. You saw the loss in acceleration between gearchanges at Bruntingthorpe when you put you 0-60 acceleration map side by side with Barrys. 1st 40mph 2nd 70mph 3rd 105mph and 4th geared to around 135mph i would say for the Leggy would be better

[valmes]

Manual, the gears are a lot shorter. Top of 4th is about 108-110mph

Yeah... it couldn’t be 3rd since it starts at around 100kph and it is not that toll... Hmmm, will have to pay attention next time to what my "uncontrollable" parts are doing...

For some reason I thought I did one more gear shift, which wasn't really necessary, at least I never did it before... I guess it must have been 4th to 5th??? Dave you confused me here... My mind/memory is playing tricks on me?

Will have to save my log next time and find out what was the speed at what gears.

[valmes]

Gears:
1st 3.333
2nd 2.105
3rd 1.407
4th 1.031
5th 0.761
fdr 4.111

[bradc]

I'm going to be running a manual gearbox with an auto transfer case, which will mean my gears will be (6000rpm)

62.33
93.78
140.34
191.58
259.50


Which compares to the stock manual 4.111 at

55.86
84.06
125.76
171.66
232.56


This should mean I will not need to change into 5th on any drag strip, and it will lower my cruising rpm nicely on the motorway too