VS Manta #218

[vs manta 218Participant Vs hsv manta View build HERE Member since: March 2, 2015 Posts: 796]

today was farkin awesome 

 

 

I got up and and my tuner leppy called me and asked what I was doin, I said drilling 2 holes in my throttle blades so this idles on 0% throttle , his reply was good cause I’m 20mins away

 

 

We fired the old girl up with 2 by 1.5mm holes and still wanted to stall so drilled them out to 2.5mm and 0.4% throttle had it ideling beautiful at full temp

 

 

After that we said well it’s time

 

 

So up the drive way we went, and scrap the pipes as I left the drive way, oops, better raise it later I think lol

 

as I went through 1st and second with absolutely no tuning besides been in the drive way it was amazing to drive, it was smooth, no serging and just putted around the corner in 1800rpm in 2nd

 

This is something this car has never ever been able to do

 

After about 2-3 hours of doin some drives then pulling up looking at logs and modifying tune it was just awesome, my mum could drive it, we crept onto boost a few times with very little timing in boost Tables but gave us a idea of how it’s behaving and its transition point as it goes over 100kpa MAP from main VE table to boost VE table

 

The car is finally pleasurable to drive, it’s happy, it loved the drive today and it’s never loved anything besides 50% to WOT before today

 

I can happily Cruze in 1st or any gear at 1600rpm with a 252-260 solid roller cam and 1000cc injectors

 

still needs a bit more on hot starts but was starting with no throttle at 85 degree at the end witch is pretty good considering we only did a hand full of changes to fuel and spark on cranking to achieve that

 

 

Trying to hire the dyno next Friday or Saturday for a few hours to do some WOT runs then it’s back to the street tuning again

 

                     

[VRSenator065Participant Adelaide SAVR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project) View build HERE Member since: February 17, 2015 Posts: 5 777]

soooooo much in the tune, awesome, i can see in the post how happy you are.  Cool as

[vs manta 218Participant Vs hsv manta View build HERE Member since: March 2, 2015 Posts: 796]

Cheers Gary, nerve racking times but so happy after it all starts to run nicely

 

Got some vids and pics on my FB page

 

 

I can not load the vids on here as I didn’t take them, my tuner took them and them and I just shared it to my self from his page

[VRSenator065Participant Adelaide SAVR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project) View build HERE Member since: February 17, 2015 Posts: 5 777]

Having a time out from gardening with the misses Pete, so checked out those vids on your fb page, sounds bloody awesome.  Hope you don’t mind I know a way of downloading off Facebook so I have done them for you.

[KroozerParticipant Forbes, NSW91 VN SS View build HERE Member since: February 19, 2015 Posts: 336]

Sounding bloody mint mate 

[vs manta 218Participant Vs hsv manta View build HERE Member since: March 2, 2015 Posts: 796]

Well today was just as good as last Friday, got a call asking if I wanted to hit the dyno so of I went, driving there my nerves where just completely  shot

 

 

Getting there and they got even worse

 

 

Our plan was never to be pulling huge power, we simply want it running nicely and very safely so I can clock up some km as this motor still only has 450km on the clock at this point

 

 

So hocked up the inavate wide band Into my collector as that’s what we use to tune it and back it on to the rollers and then had the dynos wide band up the tail pipe to see any comparison as not many people have wide band provisions in there collector to be using and see the difference to tail pipe

 

 

The results of this are the tail pipe always reads slightl leaner then the wide band in the collector so the lambda on the screen in pic is actually a little out as our wide band in collector is more accurate and around 0.8 lambda is our target under WOT and 1 lambda at cruising

 

so first things first anyone that said I was goin to loose low down torque with my new extractors I made, sorry to say it but you are way way wrong

 

 

Below 3500rpm I picked up nearly 200rwnm of torque

 

Secondly my boost has significantly dropped with these new pipes,  before at 6800 rpm I had 18 psi, now at 6800rpm I have somewhere between 13-14 psi so the pipes are a massive improvement with flow

 

 

So previous results where 430rwkw at 6800rpm on 98ron

 

we looked at the 4 power runs last tune on the dyno computer and the last 2 ran lean as fuck, Into the mid 13s AFR, 3rd last run was good AFR at 410rwkw so really that’s where the last tune should have stopped

 

I was not happy and I think it’s a real blessing in  disguise that my fuel pumps fucked out and I never got to drive it after that tune till now with this new tune as it would of surly fucked my motor quite quickly

 

So onto today’s efforts 3rd power run with a absolutle massive 9.5 degrees of timing and 29 degree Intake air temps and it slapped down 400rwkw at 6300rpm

 

 

Next power run we encountered the dreaded wheel spin and trying several different ways of strapping it down didn’t change it

 

 

Final results on e85 we didnt get a read out more then 400rwkw but it did the same back to back 3 times in a row with 399rwkw on the last 2 looking exactly same as this

At 5900rpm it just brakes traction and can see that clearly on the power cord just above and to the left of the arrow on screen and can see it’s still running a little rich as what looks to 0.85 lambda is actually 0.8 on the wide band fitted in the collector and it contunues making power till 6800rpm

 

 

So final run seen

399rwkw at 5900rpm at 11psi and continues till 6800rpm and 13-14psi

A massive 11.5 degrees timing

29 degree Intake air temps

 

 

That power line looks like it would go to 430-440rwkw if it keeps traction right now

 

We believe we should be able to get 15-17 degrees Into it with this air temp not a problem and we haven’t turned on the meth injection and with this air temp I don’t think I will either

 

 

 

 

• This reply was modified 9 years, 1 month ago by  vs manta 218.

[VRSenator065Participant Adelaide SAVR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project) View build HERE Member since: February 17, 2015 Posts: 5 777]

Pete, thats totally bloody awesome, seriously!!!  But you have to piss off those low aspect ratio rear wheels!!  Look at every single drag car and they have side wall on the tyre to give traction.  I know that means changing the rear brakes you have but seriously this car has gone up another two  or three levels since you fitted them, your making 800hp!!!   Rear brakes do very little anyway  Run some sort of 4 piston callipers on there so you can run a smaller diameter disc so you can get some 15s on there, then you can see what this bad boy can really do.

[vs manta 218Participant Vs hsv manta View build HERE Member since: March 2, 2015 Posts: 796]

I can fit 18s on it lol

 

 

I was actually looking at smaller rear brakes just the other day for this reason lol

 

 

I have 2 lots of 18 inch rear rims to use but haven’t got any tyres on them and they are only cheap ones I found

 

 

I’m actually looking for a nice set of 18s and goin to run nitto NT05 tyres on it

[VRSenator065Participant Adelaide SAVR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project) View build HERE Member since: February 17, 2015 Posts: 5 777]

mate run 15s on the dyno and strip, somthing with some sidewall  Our cars are IRS they need all the hlp they can get 

[vs manta 218Participant Vs hsv manta View build HERE Member since: March 2, 2015 Posts: 796]

Dont think i will ever put small enough brakes on the rear to fit 15 rims on this car ay

 

Im really not out for 1/4 mile times, its purely a street/fun car

 

<span style=”line-height: 1.5;”> </span>

<span style=”line-height: 1.5;”>Sure i will take  it down there for some fun but i dont ecpect any great times with coil overs, manual, and 18 inch rims </span>

 

<span style=”line-height: 1.5;”> </span>

<span style=”line-height: 1.5;”>If i was to build a drag car i would keep it simple, big cubes,big stall auto, small light car running on methanol with 4.7 diff gears and nothing in it besides me and a engine </span>

think a vs shell would be my last choice for a drag car

[VRSenator065Participant Adelaide SAVR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project) View build HERE Member since: February 17, 2015 Posts: 5 777]

Your car of course, so totally your call, there are options though for brakes that will fit 15’s that aren’t for drag use.  My car just passed full engineering including dynamic braking tests with them.  Its not about building a drag specific car, mines not that either, its more about being able to put the power you have to the ground, or in this case the rollers.  How will you be able to tune this car at wot when you cant keep traction on the rollers and so cant tell whats its doing?  You can fit 18″ rims over my brakes so you lose nothing compared to what you have now, except you could have a set of 15″ steelies so you could fit for testing/tuning.  Anyhow as I say, your car your call, just shooting the breeze.  Great numbers btw.

[cava454Moderator 93 VR BT1 View build HERE Member since: February 20, 2015 Posts: 2 390]

There is a greater parastatic loss when using a tire with a bigger side wall. This is why u see a lot of car in dyno comps run low profile tires.

[VRSenator065Participant Adelaide SAVR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project) View build HERE Member since: February 17, 2015 Posts: 5 777]

Well, don’t know enough to argue that but I do know every drag car runs sidewall.  Pete’s not trying to win dyno comp, hes just trying to get it to not slip on the rollers.  Maybe a pair of semi slicks on the rims he has then? Anyhow, his car his choice.

[vs manta 218Participant Vs hsv manta View build HERE Member since: March 2, 2015 Posts: 796]

Iv actually been told drag tyres, semi slicks are no good on a dyno and slip just as bad, been told any soft or new tyre is no good

 

 

When tyres are new they have oils in them and these come out when the tyre becomes hot and makes it sticky for the road, but this is bad on a dyno roller

 

 

Soft is great on a road but not so great on a 2mm nurling

 

 

Need really old really hard tyres where all these oils have already come out of them

 

we don’t really need a dyno as I have the provision for wide bands in my collectors and we just screw them in and this wires into leppys inavate wide band and there it goes into efi live and displayed with all other data

 

 

So we are goin back to some road tuning again soon and see how that turns out for us lol

Might still have traction issues though

 

 

To be honest I’m just over the moon I can actually drive it without surging wildly and nearly hitting my face on the dash and snapping axels

 

 

Taking it to C4C in VIP section in a few weeks

[vs manta 218Participant Vs hsv manta View build HERE Member since: March 2, 2015 Posts: 796]

380rwkw and the v2 blower I didn’t have a problem

 

 

The v7 is proving a different story lol

[VRSenator065Participant Adelaide SAVR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project) View build HERE Member since: February 17, 2015 Posts: 5 777]

Intersting info thanks for that.  Only shooting the breeze really, this cars come a huge way mate, shotgun a  ride when I am up in qld.

[vs manta 218Participant Vs hsv manta View build HERE Member since: March 2, 2015 Posts: 796]

That was actually a big surprise to me as well

 

 

I have also been told 4:11 gears doesn’t help with traction at all either lol

 

 

Yeah to easy with the ride

[vs manta 218Participant Vs hsv manta View build HERE Member since: March 2, 2015 Posts: 796]

http://s1045.photobucket.com/user/pahchay26/media/Mobile%20Uploads/20150912_145350_zpsmmtl4hbe.mp4.html

• This reply was modified 9 years, 1 month ago by  vs manta 218.

[vs manta 218Participant Vs hsv manta View build HERE Member since: March 2, 2015 Posts: 796]

http://s1045.photobucket.com/user/pahchay26/media/Mobile%20Uploads/20150912_135443_zpsbk22pmii.mp4.html

[KroozerParticipant Forbes, NSW91 VN SS View build HERE Member since: February 19, 2015 Posts: 336]

Correct with tyres for Dyno’s, you want the hardest tyres possible

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