when do your engine starts knocking ?

[renxun]

let say during a full retard on 15degree timing, on 97 petrol station pumped fuel, at what boost level we can start noticing slight knock? i dont have any knock detecting device so i will just have to go very general with you guys who are more experienced in tuning.

on d recent drag race... (last week in exact).... i ran 12.8sec on my 1j corona, t70 turbo winded up to 1.7bar on street tyres..pumped fuel with penzoil octane boosters...and i was being beated down by a levin te71 4age with a gt3037 winded to 35psi running on F gas fuel... (i dont know what is the octane reading of this). clocked 12.5sec on nitto 555 drag xtreme tyres.

that time i was initially running on 1.4bar but when things got heated up i had no choice but to wind up during the last minute. managed to did 2 runs to check do d air fuel and didnt manage to even consider about the timing... what i did is i just put in xtra dose of boosters in my tank.

question is.... lets say if the 4age is running on 110 octane... at that particular amount of boost wouldnt if be knocking like hell? and the air temp at that moment is around 35degree celcius at the track dude... i was being teared off like nothing on 2nd gear.... during the last few rpm b4 shifting to 3rd there was like 2nd part of power pushing out of the car... i was wondering if he ticked off any scramble boost during that time...

but after 4runs.....the levin dies... cannot idle at all .... all the fast cars at my place here runs on crazy boost... i was being given a good chase by the ke70 running on 2tg turbo.... 45psi i was being told..... was just less than 0.3behind me.... im so confused that some didnt had their engine blown for good....i was worying like hell on 1.7bar (25psi) and they just happily going above 2bar without worries.

[jak]

i think you need to concerntrat mor on the knock than the tune for a minute.

is it a knock or is it pinging or detonating?

if its a knock, the chances are its not your tune and that your motor might have done a bearing.

2tg + 45psi. id say u were being bullshitted to.

Jak

[CHB]

i think you need to concerntrat mor on the knock than the tune for a minute.

is it a knock or is it pinging or detonating?

if its a knock, the chances are its not your tune and that your motor might have done a bearing.

2tg + 45psi. id say u were being bullshitted to.

Jak

2TG with 45psi is really NOT a myth.. it really exist... i m not sure how the mechanic did it, but it really out there..

[renxun]

i think you need to concerntrat mor on the knock than the tune for a minute.

is it a knock or is it pinging or detonating?

if its a knock, the chances are its not your tune and that your motor might have done a bearing.

2tg + 45psi. id say u were being bullshitted to.

Jak

sorry my wrong... should be detonation i should say...

well.... as i said.. i was being told 45psi... i might be bullshitted.... as 45psi is somewhere at 3bar... which is ridiculuos.... however.. lets get back to topic...

[jak]

it shouldnt be in fuel, unless your car is tuned for a high RON and your running a substantially lower ron.

i would just get your tuner to give the tune a check over. might just be lacking fuel at a certain rpm.

im just saying its not every day you see a 2t with 45psi going through it.

Jak

[renxun]

bro... i went through your youtube and saw your ET...

Mine sharing what is your setup like? such as turbo type, boost setting, fuel type, rear suspension,wheel size, tire type and rear diff ratio.and do you use spray to get your 11.078?

[jak]

standard ct12a's, 25psi, C16, IRS, 16" rims, 255/50/16 m/t et street radials, i belive its a 3.9 or around that.

yea 150shot of nos, but we did run a 11.081 with only an 80shot.

we have tune issues at the moment as its breaking down on the line (due to excessive fuel i think).

Jak

[renxun]

you running on auto or manual..? if u are running on auto how much your torque converter are being locked to?

[o_man_ra23]

OK, you said your being gunned down by a TA72 with a turbo'd 4A-GE running drag slicks??

Now, thats a fairly light car, 1.6Ltr motor probably with the bejeezus bombed out of it, and if he is running slicks he probably has the suspension setup for drag to. SOOOO.... he is going to launch harder and faster than you, allowing a much more rapid acceleration at the start, which is where most drag races are won/lost. Then, he has a smaller, lighter car with less drag, so as the speed climbs higher, he doesnt need as much power as you to accelerate as quick.

I would suggest doing a few things:
1. sort out a water injection system as your ambient temps are pretty nasty
2. get a better tuner if your worried, a well tuned system will handle a fair amount of boost with pump fuel
3. get a set of drag slicks... stickier tyres means less power lost to wheelspin
4. ???
5. PROFIT!!

You also said you had a KE70 with a 2TG thats off its tits that was slower than you... thats not a good sign for the lightweight KE70

[renxun]

no its not a TA72 as TA are celica at my country. its a TE71. hatchback...surprisingly i caught the traffic lights better and i got hold of the launch timing on the dot. but the question is, his higher rpm.... lets say when it hit 6-7k rpm there was like another power peak which screams the car like fark and pulled me there. if it wasnt the 2nd power peak he wont be able to throw me off as i was always catching up when the 2nd peak came and i was being thrown like nothing.

so...

for the water injection system.... where should i inject? right b4 the throttle or inject water to my intercooler to bring down the temperature?

i tune my car myself as there werent any tuners here at my place. chris davey from tis forum guided me all this while for the tune.

OK, you said your being gunned down by a TA72 with a turbo'd 4A-GE running drag slicks??

Now, thats a fairly light car, 1.6Ltr motor probably with the bejeezus bombed out of it, and if he is running slicks he probably has the suspension setup for drag to. SOOOO.... he is going to launch harder and faster than you, allowing a much more rapid acceleration at the start, which is where most drag races are won/lost. Then, he has a smaller, lighter car with less drag, so as the speed climbs higher, he doesnt need as much power as you to accelerate as quick.

I would suggest doing a few things:
1. sort out a water injection system as your ambient temps are pretty nasty
2. get a better tuner if your worried, a well tuned system will handle a fair amount of boost with pump fuel
3. get a set of drag slicks... stickier tyres means less power lost to wheelspin
4. ???
5. PROFIT!!

You also said you had a KE70 with a 2TG thats off its tits that was slower than you... thats not a good sign for the lightweight KE70

[jak]

im running an auto, 2800rpm convertor. lock up clutch is on a button and can be on with the flick of a switch, sop its relly up to when my bro (driver) turns it on.

Jak

[renxun]

thats very impressive.... but fully stripped off interior? your ET is totally at my jealousy level which i dont think i could ever achieved that..

[o_man_ra23]

Sorry, my typo, did mean a TE. Still a very light car. Water injection before the TB... do a search, theres some great articles on how to do your own home grown water injection really cheap and really effectively.

[Pube]

your times seem slowish? whats the track like? I managed a 13.1 with my old 170rwkw 1G corona. Maybe you need to get a better setup before you chase more power?

[renxun]

our track is not a proper drag strip... its an old airport strip that they convert it into a drag racing ground... its rough compared to the normal road we use out there... imagine the track when i hard launch my car on a pair of silverstone semi-slicks i only manage to do around 10 launches b4 you will see my my rubbers finishes till the poly ply beneath the rubber