Jump to content

ZF box ? playing up at drags


Recommended Posts

Had a go at the drags this weekend, 2009 FG XR6T with 300rwkw tune road tyres dropped to 25psi on the rears and ZF 6 speed box. Got some clean runs in at 12.9 secs and TV's around 110-113mph but I know its got more in it. Couple of problems, "sport" mode didnt seem to do any better than normal drive......is that what you'd expect ? On a number of runs the gearbox or something seemed to do a big stall between 1-2 and 2-3 ...............must have cost half a second each time.  Seemed to happen more often in sport mode. This is with 2 hrs between runs so hard to imagine its gearbox fluid temp ? Also I had a cooler fitted to the box. Any thoughts ? Be nice to run into the high 11's.................is that doable on that power using drag slicks ? What size will fit ? 275's ? Go for a smaller rim ?

Link to post
Share on other sites

12.9 is allitle slow for 300rwkw should be able to dip into mid 12s with that power,, what mods you got for 300rwkw? 
 
has the ZF been tuned? 
 

either your launch I.E 60 foot needs improvement, your not making a true 300rwkw Or the ZF is the issue could be in the tune or has the car got a heap of Kays on it? ZF could need a freshen up or a service 

 

hmmm anyone please correct me if im

Wrong but I don’t think 300rwkw is

Enough to dip into the 11s in the heavy falcon 

 

when my fg f6 was making 350rwkw I was touching the high 11s but I was on street tyres and my 60ft weren’t anything crash hot either so I think you may need allitle more for 11s

Link to post
Share on other sites

300rwkw is going to be a tall order to break into the 11's - especially on street tyres.

I'm running 350rwkw on E85 and on drag radials I'm "only" doing 11.5's @ 121mph (1.75sec 60').

Street tyres with 350rwkw I was doing 12.2's - albeit about the same 1.9-2.0sec 60' as when I was stock and running 12.9's as I was having trouble getting all that E85 torque to the ground haha

 

I'm tuned with PCMTec and have another round of racing this Friday - at the end of the night I will put some street tyres on, choose the mid tune (which is about 300rwkw on E85) and let you know how I go :)

Link to post
Share on other sites

Yea post back be great to hear how you go!!,, I’m more about the roll racing these days it’s just easier on the driveline not having to worry about the launch staging etc... still enjoy the Christmas tree challenge I just don’t get out there as much

Link to post
Share on other sites
Hey.
So after turning up late and only getting one qualifying run in (11.8 ) I went straight into eliminations.
After being knocked out early on in C2 class (Street car class, turbo 2wd. Must have rego and wof) by a stripped out R32 Skyline that is trailered to and from the track - so not really a street car..... Not that I'm bitter about it haha.... I didn't do any grudge racing to test the lower tune out.

Soz!
Link to post
Share on other sites

Hey 11.xx for amount of power your running is great and roughly what I expected, good work!! Thanks for posting back and letting us know how you did! Shame about the skyline dosent sound like a street car to me haha 

Link to post
Share on other sites
  • 3 weeks later...

I had an interesting experience on Friday.

The track wasn't there and with small FGX turbo, the torque hits too hard in first and I just spin, even with Mickey Thompson drag radials on (albeit slightly worn).

Thought I'd try starting in second. Worked well but felt like it was slipping all through second and a little in third.

Not sure I like the idea of starting in second as I imagine it has to slip a little initially and seems to find it hard to lock up....


Anyone else tried launching in second?

Link to post
Share on other sites

I have as I thought first gear in the turbos is to short and I'd get a better time..... nope no good.. I always got the best time launching in first...


Are you considering a ZF rebuild? 

Edited by TRYME
Link to post
Share on other sites

That way works good when you get the hang of it. You'll probably get off it then floor it again in 1st gear cos it'll probably hook up again after 4500rpm at wot.

 

Another way is to shift into second a smidge before the boost kicks in.

Link to post
Share on other sites
On 21/03/2021 at 10:17 PM, TRYME said:

hmmm anyone please correct me if im

Wrong but I don’t think 300rwkw is

Enough to dip into the 11s in the heavy falcon 

 A FG and F6310 sedan can and should do high 11’s all day long when making a true 290+ RWKW and tuned correctly to do so. Been there and done it quite a few times over the years. M/T’s Street ET’s, Boost off the line, torque reduction limited and obviously a good tune ;)

Link to post
Share on other sites
40 minutes ago, Puffwagon said:

That way works good when you get the hang of it. You'll probably get off it then floor it again in 1st gear cos it'll probably hook up again after 4500rpm at wot.

 

Another way is to shift into second a smidge before the boost kicks in.

I'm leaving on anything up to 10PSI as long as the track will hold it (well could go to I think about 16PSI but that's driveshaft twisting/input shaft breaking  territory or it just does a burnout on the line....) - so I generally don't need to wait for boost once I've left. Usually leaving at about 2,800rpm and try and hold 2-4PSI.

 

I feel like if I change early from 1st to 2nd early, the change is quite long and the decceleration jolt as it changes is quite severe.

Link to post
Share on other sites

Mate as you already mentioned don't leave the line with 16psi youl deffs break something 

 

1 hour ago, JETURBO said:

 A FG and F6310 sedan can and should do high 11’s all day long when making a true 290+ RWKW and tuned correctly to do so. Been there and done it quite a few times over the years. M/T’s Street ET’s, Boost off the line, torque reduction limited and obviously a good tune ;)

Ahh the MTs probably help allitle hey, what about on good street tyres jet? Reckon it can be done? Something like Michelin pilot 4S ?

Link to post
Share on other sites
Mate as you already mentioned don't leave the line with 16psi youl deffs break something
Yeah I know. I was just making a point that I can leave the line on boost and don't generally have to wait for it to build or kick in Midway through their gear like stock.
Link to post
Share on other sites
5 hours ago, TRYME said:

Mate as you already mentioned don't leave the line with 16psi youl deffs break something 

 

Ahh the MTs probably help allitle hey, what about on good street tyres jet? Reckon it can be done? Something like Michelin pilot 4S ?


Have managed to get a customers G6ET that made 320rwkw to 11.9 with Bridgestone Potenzas on lux pack 19’s before so yeh a good quality tyre can definitely cut it 

Link to post
Share on other sites
What was the mph?

With a terrible launch (spinning all through first) the best I could do with 350rwkw and running VERY cheap 235 tyres was a 12.2 with a 60' that I think started with a 2.....
MPH was around the same as I get usually of 119.

Good tyres would defo get the et down to high 11's.
Link to post
Share on other sites

From memory up around 118-121mph 

 

A genuine 300rwkw should net that figure in a full weight falcon 

 

A 350rwkw falcon should get up around 123-125mph 

 

A 400rwkw falcon should go 129-132mph 

Link to post
Share on other sites
Mate those are very happy figures and would love to see time slips with those claims!

My pics attached.

This is what a genuine 350rwkw (ok so 346.8rwkw) E85 burning, full weight FGX does.

You're a bit off on your kW to mph figures from what I've seen an experienced.

There's a few ~480kw full weight 8's over here that are running mid to low 10's and they're 130-133mph. I don't see how a Barra with ~80kw less could keep up? b93020e39c6032837e5d4c4150f008c5.jpgcd2af1534aa66f920e427af2ca3c47ee.jpg
Link to post
Share on other sites
Lovely.

Perhaps a built driveline and full noise launch might get a 300rwkw Falcon down to a low 1.6, high 1.5 60' - but if we're talking about that sort of mods, they're generally more than 300rwkw so not very comparable.

Again, feel free to share time slips.
Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...