Good day to all,

Current set up of my 2007 SG is the following after the last engine mods

1. S&S 106 Big bore kit
2. S&S 551 Easy start cams
3. S&S tc3 oil pump and cam plate
4. S&S quickee pushrods
5. S&S tappets
6. S&S power tune headers and Vance & Hines slip ons (3.5).
7. S&S Stealth air cleaner
8. Thundermax ECM
9. Mild head work
10. Bigger valves
11. Jagg oil cooler
12. VPC 84 - AIM

For the moment I am in the break in period.
The T.B is stock 46mm, also the injectors are stock.
If the T.B will be ported to 50mm will it provide any performance increase or the bike will loose low end torque.
Is it worth to go for it ?

I have read that the stock injectors are good if I am not exceeding the 5.000 RPM which I don't.

Any suggestions for the T.B. ??

Thanks

 

The performance increase will be negligible but there will be a small one. Maybe one to three horsepower and torque.

 

Thanks for your reply.

 

Good day,

Should I change also the injectors to 4.9 or the OEM are adequate for the current settings of the bike??

Thanks
Vasilis

 

Just finished my 107 build and went with the S/E 50 throttle body from harley as it comes with the 49 injectors. Mine was a 2007 with 71,00 on it. Dynoed at 113/115 and runs great. Cheaper to buy than to have ported with new injectors

 

Assume that we dont have the same cams (551).
As I have read the 4.9 injectors are required only if the bike has more than 100 hp.
With my set up I believe that I may be on the range of 95 to 100 hp (once the break in period will be completed I will take the bike for a dyno).
Will i see any performance increase by installing the 4.9 injectors or only the fuel consumption will be increased?

thanks
​​

 

when I had my 07 dyno tuned the tuner showed me on the screen where the bike was "hitting" or "bumping" off that nice smooth line do to stock injectors...blah blah blah

needed bigger, he said 4.9 would do...or bigger

tb said i was ok, might wistle or lose a little up high in the rpm's

 

I had the heads done and Iam running 777 cams.

 

you need bigger injectors to eliminate the rare occassion that you will max out the capacity of current injectors.

i would go 5.3 off a 50 mm tb. lots of hd used ones available. i would not buy new. those parts work or they don't

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