engine tuning

mera red gti

mera red gti

hi all, reading thru Stu's thread and some others it would appear that gaining more bhp isn't as straight forward as it would seem.
and with the slim chance of a rolling road day looming i like to start a thread with;

my calculations for looks well off as i dnt have as much done say stu but...

model - GTi
age - 1999
engine size - 2.0
fuel - petrol
stock power - 143bhp atf
mods -
JPerformance 4-2-1 header and 2.5' downpipe - 8bhp
resonator decat - 3bhp
torqueflow ss back box - 2bhp
PiperX panel filter - 3bhp
estimated power - 159bhp atf

now i know its not as easy as this but, why not?
edit - pls add each engine mods own bhp increase or is that not possible.

david
 
model - GTi
age - 1999
engine size - 2.0
fuel - petroleum
mods - SSAC 2.5"
GTiR mongoose decat
AAS 2.5" catback
injen CAI
timing at 17 degrees
stock bhp - 143
estimated bhp @ the flywheel - (not optimistic) 155
 
model - Si
age - 1998
engine size - 1.4
fuel - V-Power (98)
mods - OBXR header, mongoose gtir decat, powerflow backbox, BMC DIA on a long reach, 15 degree advance timing, v power
stock bhp - 84
estimated bhp @ the flywheel - 95
 
model - N15 Gti
age - 1999
engine size - 20L
fuel - Petrol 97 octane
mods ( old set-up ).........
HS header
2.25" MIJ mandrel Cat back
Decat
JWT s3r cams
Apexi filter
Lightweight flywheel + 4 puck racing clutch
Nismo FPR
stock bhp 143
estimated bhp @ the flywheel 185
dynoed WHEEL hp 158 ( stock 120ish )
 
model - N15 Autech
age - 1996
engine size - 20L
fuel - Petrol 95 octane

60mm catback
FGK backbox
11.5:1 pistons
high lift cams
ecu mapped accordingly
fidanza flywheel
unorthodox racing crank pulley
pipercross panel filter

stock bhp 173
estimated bhp @ the flywheel 180
 
Well the mere fact that it's tuning by numbers aka using the modification abacus, i hope no-one is thinking these figures are accurate.
 
JClark said:
I hope you lot are taking power loss due to mileage into account.
Click to expand...

last yr i went on a RR at pod, made standard power at 4k rpm with 90 lb/ft.flat spot at 4500 so operator backed off. since then ive fitted better filter and dropped the timing back. feels better and a RR will hopefully tell me so :)
 
Ah, ive typed this wrong, ive written up the changes the autech has over the standard gti. Its all estimates anyway, theres no set increase for any modification.
All mines had over standard is the underdrive pulley and air filter. Whos knows, maybe I get 14bhp extra, I just drive it
 
1999 gti 85k

pipex filter
autochrome header
resonated decat
2.25 longlife catback
9lb flywheel, standard clutch
smothed out TB (fucking shit)
jwt s3r cams

171bhp at the fly
 
model - SRi
age - 1997
engine size - 1.6
fuel - petrol
stock power - 99bhp
mods -
K&N induction w/CAI - 5bhp
Polished TB - .5bhp
Timing set to 15 - 2/3bhp
5zigen backbox - nowt
132k miles - -22bhp (1 bhp for every 6,000 miles)
estimated power - 85.5bhp

or something.
 
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