Considering a 4ac may take more than it's worth to generate considerable power.
That said a sohc can be well tuned and can compare to a dohc. Or atleast make your sr5 tuned and enjoyable.
Some honda tuners choose sohc heads for legitimate reasons. Less mechanical parts, popular for boosted
Consider a automatics diff. For what a 4ac is its a major benefiet. I'm surprised how well its able to crawl or climb open throttle up hill. It has way nicer gearing, just dont expect high end it drops off at about 100. Low range is SR5Awesome.
Specs are closer to a gts diff
A weber carb or near equally-a full vacuum delete to a stock carb will help.
Dual valve springs may be excessive. Unless you have enough power to need them.
A adjustable or fixed aftermarket cam is a reasonable upgrade.
Remove your a/c unit, not a 5hp gain but less resistance on motor and nice weight reduction.
Exhaust is a good idea. 3in if going boost.
Itb's conversion(independant throttle bodies)
A mild cylinder head porting can unlock response and motor will breathe more efficiently, unlock power.
A full port/polish on any head will make a significant difference.
A 3 degree valve angle job or higher will add power, 3 is popular but more angle is fine, discuss it with a machinist.
Find a local shop and harrass some crotchity ole machinist, you may find one thats willing to help you understand everything on your level and know whats going on with your motor. I've learned a lot by personal interaction. I can only comprehend so much from reading and judging info thats new to me.
I really want to try out a 4ac with itb's. Possibly box them and run a screw top super charger. o m g.
Crower springs(single) aftermarket cam and a 5 degree+ angle valve job.
I have two 4ac heads I'm going port and polish in the couple weeks. In the learning stage and will have a instructor for the extensive work. If you have experience with power tools a die grinder is all you need for the basic intake/exhaust porting.
Also a larger carb injector may be needed. For such a small motor port work is easily worth it if its bench flow tested.
Running a ultima battery actualy made a very noticable difference in response. Not bookoo hp, efficiency in small places.
The primary reason a 4age has its power is in the head, why do people run itb's on a 20v?
For breathing. Gasoline motors are designed to burn fuel not explode the molecules, we use a fraction of combustion potential. Efficient breathing and combusting can be overlooked. Smashing air into smaller bits and compacting it into a chamber mixed with fuel has to be balaced, a hewge bolt on turbo or sc isn't worth it to me unless the power displacement is where its desired. You can also run sequential turbos on your 4ac for a more constant boost. Yes you can sc/turbo a carb.
I've had........a lot of sr5's and when tuned up abit they have Plenty of potential and make a great introduction to driving, depending on intent. Sr5 for heavy drifting-no. Can you drift or grib/slide a sr5, yes to a extent. Rear end is inferior but thats a good first gts conversion, ford 8.8/9 toyota m46 rear ends imo if you cant find a gts end.
Really you should realize the power behind your wheel and your ability behind it. Drifting a sr5 can be dangerous, I've entirely on accident at 55+ completely kicked into a couple of serious drifts on wet or icy mtn roads and besides "4 wheel" drifting the open diff was about useless. Difference in sling shotting a 4ac open diff to actualy countering a 4age's wheel spin is huge. I'm not trying to make any major statements, you should really do your research. There's a local "built" sr5 coupe w lsd, it's fast and responsive, probably has more whp than a stock 4ge. Really comes down to how much time and money to go into it and the type of driving its for. Wet parking lot sr5 drift all dae, logging roads fo sho, mtn rds sketchy.
8-9 years of ae86's a sr5 tuned is enough to keep up in corners with a lot of s talkers. Good luck with the 86.
