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Author F16 or F20
BAZ 1256
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Registered: 16th Mar 04
Location: aberdeenshire
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26th Apr 04 at 21:07   View User's Profile U2U Member Reply With Quote
FITTING A NEW BOX TO MY 2L CORSA COS HAVING PROBLEMS GETTING MINE INTO 3RD WHEN RACING AT EDZELL.
WHAT BOX SHOULD I GET? NOT WORRIED ABOUT TOP END SPEED JUST WANT ACCELERATION. HAVE A F16 JUST NOW BUT DONT THINK IT IS THE CLOSE RATIO VERSION. THOUGHT ABOUT GETTING ANOTHER F16 BUT ACLOSE RATIO ONE FROM A CAVVY SRI OR SUCH LIKE .
WHAT YOU'S THINK???
J100RSA
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Registered: 4th Mar 01
Location: Thornhill, West Yorkshire
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26th Apr 04 at 21:45   View User's Profile U2U Member Reply With Quote
i got an f16 wr in mine its quicker and has mad as fook top end but is fooked after 1500 miles as cant handle the torque of the valver
corb
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Registered: 24th Apr 02
Location: Calgary, Alberta, Canada
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26th Apr 04 at 22:25   View User's Profile U2U Member Reply With Quote
i much prefer my F16 to the F20. Acceleration improved by almost a second yet retained top end speed.
Ian
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Registered: 28th Aug 99
Location: Liverpool
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26th Apr 04 at 22:28   View Garage View User's Profile U2U Member Reply With Quote
I might end up putting an F16 in mine, they get a good review by all accounts - unless you break them eh Dan
chris_uk
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Registered: 8th Jul 03
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26th Apr 04 at 22:37   View Garage View User's Profile U2U Member Reply With Quote
dan was tellin me that he went through.. 3 was it dan in 6 months??
Neshol
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Registered: 10th Jul 02
Location: Midlands
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26th Apr 04 at 23:55   View User's Profile U2U Member Reply With Quote
Cybermonkey
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Registered: 22nd Sep 02
Location: Sydney, Australia
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27th Apr 04 at 08:20   View User's Profile U2U Member Reply With Quote
well it has a suggested torque rating of 160lb/ft. So with a standard 20XE putting out just under this, and tuned going over 106, its bound to get worn easily when you got a heavy right foot.
Keithie
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Registered: 31st Dec 03
Location: Isle of Lewis
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27th Apr 04 at 09:36   View User's Profile U2U Member Reply With Quote
is the f16 from gsi and f20 come with a red top? excuse my stupidness...
Cybermonkey
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Registered: 22nd Sep 02
Location: Sydney, Australia
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27th Apr 04 at 10:29   View User's Profile U2U Member Reply With Quote
F16 came in various cars in WR and CR form. Found in Astras, cavaliers. Was not used in corsa GSi, that got the F15 box which is also found in the 1.6 Sport.
Daimo B
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Registered: 20th Mar 00
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27th Apr 04 at 11:02   View User's Profile U2U Member Reply With Quote
Im perfectly happy with my F20, and i dont have to change it when i eventually tune her.
corb
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Registered: 24th Apr 02
Location: Calgary, Alberta, Canada
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27th Apr 04 at 18:24   View User's Profile U2U Member Reply With Quote
F16 was on the 2ltr 8v's.
sxi16vjoe
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Registered: 16th Dec 02
Location: Kent
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27th Apr 04 at 19:34   View User's Profile U2U Member Reply With Quote
And the 1.8 8v astra sri's?
K100RSA
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Registered: 2nd Apr 02
Location: Devon. drives: too fast
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27th Apr 04 at 20:06   View User's Profile U2U Member Reply With Quote
F16WR is not really ideal if you want to drive the car hard, but if the engine is tuned and will rev hard then not to much of a problem as 60 can be had in 2nd, and in 5th gear 90mph is a smidge over 3k rpm. just need to remember to hold the gear longer before shifting up, as 4th in the WR is the same as 5th in the CR.

also the comments about the torque figures I beleive are rubbish, pretty sure that this was discussed many times on MIG and it was proven as just folklore, and also from memory I beleive that the same size etc bearings in the both boxes so how is one stronger than the other??
BAZ 1256
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Registered: 16th Mar 04
Location: aberdeenshire
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27th Apr 04 at 20:26   View User's Profile U2U Member Reply With Quote
Right the corsa is going to be used for only 1/4 mile sprints,it has an 2l 16v engine with sbd throttle bodie kit fitted and is also away to get nitrous fitted too.
i am thinking the f16 cr box is what i will get but still not quite sure. need the best acceleration up to 100 i can get.will i get better acceleration up the 1/4 mile from a f16 CR compared to a WR or wil there be little differance??? iv got a f16 just now but think its a WR cos it drops about 1500 revs when changing gear, would that be right???
K100RSA
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Registered: 2nd Apr 02
Location: Devon. drives: too fast
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27th Apr 04 at 21:10   View User's Profile U2U Member Reply With Quote
possibly, cant remember exactly, but the real test is the 70 mph test, CR 70mph is 3k in 5th, WR 70mph is 3k in 4th and 90 in 5th, need to really go to the redline for each shift or else it just feels like its trying to bog down, but probably not too bad with your spec engine
either box you will need to reach 4th gear anyway I think so no real advantage up to 100 mph in a gearchange less, I know that mine used to indicate 122 in 4th flat out, then shift to 5th, and not really do much LOL, but prett sure that with raised limiter etc the CR will give 100 in 4th

I know for a fact that while bouncing off the limiter in 2nd I could get 62 mph, that was measured on a radar gun, and pretty sure that could get to about 93 in 3rd??, but havent driven that car for over a year now so maybe compkletely wrong


[Edited on 27-04-2004 by K100RSA]
J100RSA
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Registered: 4th Mar 01
Location: Thornhill, West Yorkshire
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27th Apr 04 at 21:55   View User's Profile U2U Member Reply With Quote
my speedo shows an indicated 143 in 4th @7250rpm and dose not read in 5th past 155
J da Silva
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Registered: 10th Apr 03
Location: The FACTory
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27th Apr 04 at 22:56   View User's Profile U2U Member Reply With Quote
were f16's in the astra gte's aswell?
Daimo B
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Registered: 20th Mar 00
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28th Apr 04 at 07:53   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by J100RSA
my speedo shows an indicated 143 in 4th @7250rpm and dose not read in 5th past 155


7250rpm?

143 in 4th?
155??

This in the corsa, i think the speedos telling big fat porkies
J100RSA
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Registered: 4th Mar 01
Location: Thornhill, West Yorkshire
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28th Apr 04 at 22:22   View User's Profile U2U Member Reply With Quote
its a wide ratio box daimo and ive got up'd rev limiter f16 wr gives mental top speed
Joff
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Registered: 17th Oct 00
Location: Cambridgeshire
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28th Apr 04 at 23:01   View User's Profile U2U Member Reply With Quote
What about the F18? Any figures on that box?
Fad
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Registered: 1st Feb 01
Location: Dartford Kent Drives: 330cd
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28th Apr 04 at 23:43   View User's Profile U2U Member Reply With Quote
i heard of V'6 using f16's
Cybermonkey
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Registered: 22nd Sep 02
Location: Sydney, Australia
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29th Apr 04 at 12:17   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by VenomTurbo
were f16's in the astra gte's aswell?


No they used the F20 (astra mk2 GTE 16v)
AK
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Registered: 5th Jul 00
Location: Aberdeen City
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29th Apr 04 at 12:24   View User's Profile U2U Member Reply With Quote
aye aye cheif.... spoke with you at edzell

Dave (luckyB) used to have this problem till he uprated his engine mounts..... give him a u2u to see if your prob is similar?

Are you running M-Tech or just fabricated mounts?

Im using an F20, it seems to be really close ratio
AK
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Registered: 5th Jul 00
Location: Aberdeen City
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29th Apr 04 at 12:26   View User's Profile U2U Member Reply With Quote
out of interest -

what cam profiles are you running?
Taper TB's??? yeah

and with you 1/4mile times, what speed are you crossing the line at?
James R
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Registered: 4th Feb 03
Location: 205GTi16/306GTi16
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29th Apr 04 at 12:57   View User's Profile U2U Member Reply With Quote
The 20SEH had a F16CR mated to it and 20XE had the F20 on it. the cluster are the same but the F16 has a larger release bearing. The Fxxxx bit is not the torque ratign in lbs, it's in Nm, so the F16 isn't strogn enough wiht a 20XE, but many ppl run them no problem.

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