Peppy's Build Thread

[JETURBO]

Hey joe, nice to see a number to tie in with it all now

What did it roll up with the 140mph tune from the drags first up ?

Either way as I like to say, the smallest dyno number with the quickets et

Farks em everytime

[Peppy_t92]

Alrighty, it was a roller coaster of emotions on the dyno yesterday

the first run up was with the exact same tune that was used during the 136, 138, and 140mph passes, which produced 426rwkw, with a very similar torque curve.. It peaked at 22psi and dropped to 19psi with AFR's hovering around 12.3-12.4

3-4 runs after that the radials were starting to work lol, you could hear them pelting off pebble sized balls of rubber all over the room, they were exactly how they came off after the drags, so they had about 16psi in them, I pumped them up to 26psi and it was blazing the tyres, they ended up at 20psi as a compromise

The car was loaded up more then it ever has been, 1) you could hear it 2) I had to alter the injector slope quite abit to achieve the target lambda at wot..

We started with the ramp rate at 15km/h, because any lower and it would blaze the tyres, tried some higher and there was only a few kW different, so I thought loaded up the most would be best

So on the low boost setting of the e-boost it ended up with

448rwkw @5500rpm

this shows boost in the bottom chart

this shows Torque in the bottom chart

peak Torque is 765.2ftlb @4700rpm

it's just on 1000nm @3800rpm

It was consistant with only a few HP differences between 3 back to back runs, I'm quite confident at this stage, thinking I just need to turn it up abit and my 500rwkw goal isn't too far away.... Nope

the yucky part, any more boost and the head was lifting, it would come on strong to 27psi but drop off to 21 by the end of the run and not making much more power..

initially I thought it was the actuator failing, so I got dad to stick his head in the engine bay for a run, he could hear a hissing sound and actually see the coolant seeping from the gasket, we then noticed small spots of coolant on the floor and even some on the windscreen of the car... it's strange as like I've said previously, I've had it sitting happily (well I thought so) at 30-28psi on the street... Possibly because of how much it was loaded up compared to the street? I'm aware that leaning it out can help with this, but I tried this on the low boost setting and it wasn't making much more power, but lost abit of torque, I like torque

Anyway, I'm going to re-torque the head to start with and have another crack

There's probably more info, but I had a big night last night and my brain is struggling this morning!

Thanks guys,

Constructive feedback welcome as always

[Peppy_t92]

For anyone that likes the technical stuff

[JETURBO]

Hey joe gotta start somewhere so on the constructive side take these into consideration for next time

Don't for the love of god use ET's on the dyno lol

A good rim tyre combo will prove more than enough, something like your front's would of been fine

The power your making the 15/16/17 km/per sec ramp rate is fine but with a good rim and tyre and strapped for "some" movement, locking it down hard has a negative effect, it's supposed to move up on the front roller at least a bit

The key is to have the tyre psi/straps/ramp rate all at a point where it's maximised ( so higher psi/tight as possible with allowing some movement and the ramp rate that works the car as had as it can without inducing spin ) takes a few pulls to get sorted sometimes

so on E85 where was your initial lambda target and where did u want it to end up ?

Edit: just seen your lambda end, u know why u have lifted the head don't you ? U see the target white line, u should of been much closer to that in the deep end at least

Edited 31/07/15 11:53 PM by Womend Bellbat

[turbotrana]

What torque are you running on your head studs. What brand head studs.

Plus forgot what head gasket you are using. I know you did those fire rings and the 3 bond.

Also whilst got ya, what trans fluid r u running. Still Gulf Western?

Edited 01/08/15 01:57 AM by turbotrana

[BenDoCo]

Love the screen shots from the dyno...... gives me something to compare to all my shots.

Interested to find out why the head lifts

Great work guys

[gaz097]

For anyone that likes the technical stuff

For someone technically intrigued but a little new, that map sensor is absolute pressure? aka minus atmosphere for boost pressure.

Secondly is that around 18 deg of timing under wot? When you change compression on these how much does that vary your maximum brake torque values?

[Peppy_t92]

Thanks Bellbat, you know how much I appreciate your feedback!!

Trana they were torqued to the ARP Specs which is 100ftlb

The gasket and fire rings are made by Ridgecrest

Still using Gulf Western mate, no issues as yet..

Gaz, that's correct mate, 35.8-14.7 = 21.1psi

Where did you see 18*? It's sitting nicely at 20.5* (the green line in the 2nd chart)

As for MBT, everyone has their own way, but I smooth it and if running e85 it will need to be raised to achieve your targets in the Borderline table

I took her out for a thrashing last night, took on board some very key tips from Bellend with some great results, let's just say it has no problems pulling through 3-4-5-6, why do our speedo's max out at 260?

Very happy with the car overall still, I'm going to take a further look into the gasket, I'm doubting that the head was lifting, I think it was probably more just passing water, possibly need a different sealant, and a re-torque...

[Skids4kids]

Howdy mate

How are you going with reading the plugs on E85 compared to 98 octane?

[JETURBO]

No problems at all mate as your a pleasure to work with because u listen

Plus u have a sexy phone voice hahahaha